WO1998045265A1 - Process for covalently coupling organic compounds utilizing diboron derivatives - Google Patents
Process for covalently coupling organic compounds utilizing diboron derivatives Download PDFInfo
- Publication number
- WO1998045265A1 WO1998045265A1 PCT/AU1998/000245 AU9800245W WO9845265A1 WO 1998045265 A1 WO1998045265 A1 WO 1998045265A1 AU 9800245 W AU9800245 W AU 9800245W WO 9845265 A1 WO9845265 A1 WO 9845265A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- dioxaborolane
- tetramethyl
- halogen
- aromatic ring
- compound
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 84
- 230000008569 process Effects 0.000 title claims abstract description 74
- ZOCHARZZJNPSEU-UHFFFAOYSA-N diboron Chemical class B#B ZOCHARZZJNPSEU-UHFFFAOYSA-N 0.000 title claims abstract description 70
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 65
- 230000008878 coupling Effects 0.000 title claims abstract description 59
- 238000010168 coupling process Methods 0.000 title claims abstract description 59
- 150000002894 organic compounds Chemical class 0.000 title claims abstract description 56
- -1 aromatic ring compound Chemical class 0.000 claims abstract description 261
- 239000000543 intermediate Substances 0.000 claims abstract description 68
- 125000001424 substituent group Chemical group 0.000 claims abstract description 55
- 239000003054 catalyst Substances 0.000 claims abstract description 54
- 150000002367 halogens Chemical class 0.000 claims abstract description 39
- 229910052736 halogen Inorganic materials 0.000 claims abstract description 38
- 229910052751 metal Inorganic materials 0.000 claims abstract description 35
- 239000002184 metal Substances 0.000 claims abstract description 35
- 238000006243 chemical reaction Methods 0.000 claims description 94
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 66
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 59
- 239000002585 base Substances 0.000 claims description 59
- BMIBJCFFZPYJHF-UHFFFAOYSA-N 2-methoxy-5-methyl-3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine Chemical compound COC1=NC=C(C)C=C1B1OC(C)(C)C(C)(C)O1 BMIBJCFFZPYJHF-UHFFFAOYSA-N 0.000 claims description 55
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 55
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 47
- 125000003118 aryl group Chemical group 0.000 claims description 47
- VBXDEEVJTYBRJJ-UHFFFAOYSA-N diboronic acid Chemical class OBOBO VBXDEEVJTYBRJJ-UHFFFAOYSA-N 0.000 claims description 46
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 40
- 229910002666 PdCl2 Inorganic materials 0.000 claims description 27
- PIBWKRNGBLPSSY-UHFFFAOYSA-L palladium(II) chloride Chemical group Cl[Pd]Cl PIBWKRNGBLPSSY-UHFFFAOYSA-L 0.000 claims description 27
- 230000015572 biosynthetic process Effects 0.000 claims description 26
- KZPYGQFFRCFCPP-UHFFFAOYSA-N 1,1'-bis(diphenylphosphino)ferrocene Chemical compound [Fe+2].C1=CC=C[C-]1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=C[C-]1P(C=1C=CC=CC=1)C1=CC=CC=C1 KZPYGQFFRCFCPP-UHFFFAOYSA-N 0.000 claims description 24
- 239000000203 mixture Substances 0.000 claims description 24
- 229910052763 palladium Inorganic materials 0.000 claims description 24
- 229920000642 polymer Polymers 0.000 claims description 22
- 150000001875 compounds Chemical class 0.000 claims description 21
- 239000002904 solvent Substances 0.000 claims description 20
- 239000007787 solid Substances 0.000 claims description 17
- 229910052792 caesium Inorganic materials 0.000 claims description 13
- 150000002148 esters Chemical class 0.000 claims description 13
- 229910052700 potassium Inorganic materials 0.000 claims description 12
- 229910052701 rubidium Inorganic materials 0.000 claims description 12
- 229910052708 sodium Inorganic materials 0.000 claims description 12
- 229910052744 lithium Inorganic materials 0.000 claims description 11
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 10
- 125000004122 cyclic group Chemical group 0.000 claims description 10
- 229910052739 hydrogen Inorganic materials 0.000 claims description 10
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 9
- 239000007800 oxidant agent Substances 0.000 claims description 9
- YJVFFLUZDVXJQI-UHFFFAOYSA-L palladium(ii) acetate Chemical compound [Pd+2].CC([O-])=O.CC([O-])=O YJVFFLUZDVXJQI-UHFFFAOYSA-L 0.000 claims description 9
- JRNVZBWKYDBUCA-UHFFFAOYSA-N N-chlorosuccinimide Chemical group ClN1C(=O)CCC1=O JRNVZBWKYDBUCA-UHFFFAOYSA-N 0.000 claims description 8
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 7
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 6
- 239000001257 hydrogen Substances 0.000 claims description 6
- 150000002940 palladium Chemical class 0.000 claims description 6
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 6
- 239000003586 protic polar solvent Substances 0.000 claims description 6
- 229910019142 PO4 Inorganic materials 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 235000021317 phosphate Nutrition 0.000 claims description 5
- 150000003013 phosphoric acid derivatives Chemical class 0.000 claims description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 4
- 125000001931 aliphatic group Chemical group 0.000 claims description 4
- 125000005599 alkyl carboxylate group Chemical group 0.000 claims description 4
- 229910052697 platinum Inorganic materials 0.000 claims description 4
- 125000005210 alkyl ammonium group Chemical group 0.000 claims description 3
- 150000001543 aryl boronic acids Chemical class 0.000 claims description 3
- 239000000412 dendrimer Substances 0.000 claims description 3
- 229920000736 dendritic polymer Polymers 0.000 claims description 3
- FFHWGQQFANVOHV-UHFFFAOYSA-N dimethyldioxirane Chemical compound CC1(C)OO1 FFHWGQQFANVOHV-UHFFFAOYSA-N 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 239000005373 porous glass Substances 0.000 claims description 3
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 3
- YRIZYWQGELRKNT-UHFFFAOYSA-N 1,3,5-trichloro-1,3,5-triazinane-2,4,6-trione Chemical compound ClN1C(=O)N(Cl)C(=O)N(Cl)C1=O YRIZYWQGELRKNT-UHFFFAOYSA-N 0.000 claims description 2
- MULNCXLCQBBVSV-UHFFFAOYSA-N 1-chlorotriazole Chemical compound ClN1C=CN=N1 MULNCXLCQBBVSV-UHFFFAOYSA-N 0.000 claims description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 2
- NFHFRUOZVGFOOS-UHFFFAOYSA-N Pd(PPh3)4 Substances [Pd].C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 NFHFRUOZVGFOOS-UHFFFAOYSA-N 0.000 claims description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical class OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 2
- 239000007868 Raney catalyst Substances 0.000 claims description 2
- 229910000564 Raney nickel Inorganic materials 0.000 claims description 2
- 150000008044 alkali metal hydroxides Chemical class 0.000 claims description 2
- 150000004703 alkoxides Chemical class 0.000 claims description 2
- 125000002947 alkylene group Chemical group 0.000 claims description 2
- 125000000732 arylene group Chemical group 0.000 claims description 2
- 150000004649 carbonic acid derivatives Chemical class 0.000 claims description 2
- VDQQXEISLMTGAB-UHFFFAOYSA-N chloramine T Chemical compound [Na+].CC1=CC=C(S(=O)(=O)[N-]Cl)C=C1 VDQQXEISLMTGAB-UHFFFAOYSA-N 0.000 claims description 2
- 229910001882 dioxygen Inorganic materials 0.000 claims description 2
- 150000002222 fluorine compounds Chemical class 0.000 claims description 2
- 239000007789 gas Substances 0.000 claims description 2
- 230000003301 hydrolyzing effect Effects 0.000 claims description 2
- 150000004679 hydroxides Chemical class 0.000 claims description 2
- YFKIWUQBRSMPMZ-UHFFFAOYSA-N methane;nickel Chemical compound C.[Ni] YFKIWUQBRSMPMZ-UHFFFAOYSA-N 0.000 claims description 2
- 150000002815 nickel Chemical class 0.000 claims description 2
- UMTMDKJVZSXFNJ-UHFFFAOYSA-N nickel;trihydrate Chemical compound O.O.O.[Ni] UMTMDKJVZSXFNJ-UHFFFAOYSA-N 0.000 claims description 2
- 150000003014 phosphoric acid esters Chemical class 0.000 claims description 2
- IFIDXBCRSWOUSB-UHFFFAOYSA-M potassium;1,5-dichloro-4,6-dioxo-1,3,5-triazin-2-olate Chemical compound [K+].ClN1C(=O)[N-]C(=O)N(Cl)C1=O IFIDXBCRSWOUSB-UHFFFAOYSA-M 0.000 claims description 2
- 125000000547 substituted alkyl group Chemical group 0.000 claims description 2
- 229950009390 symclosene Drugs 0.000 claims description 2
- 229910021515 thallium hydroxide Inorganic materials 0.000 claims description 2
- QGYXCSSUHCHXHB-UHFFFAOYSA-M thallium(i) hydroxide Chemical compound [OH-].[Tl+] QGYXCSSUHCHXHB-UHFFFAOYSA-M 0.000 claims description 2
- 229960001479 tosylchloramide sodium Drugs 0.000 claims description 2
- COIOYMYWGDAQPM-UHFFFAOYSA-N tris(2-methylphenyl)phosphane Chemical compound CC1=CC=CC=C1P(C=1C(=CC=CC=1)C)C1=CC=CC=C1C COIOYMYWGDAQPM-UHFFFAOYSA-N 0.000 claims description 2
- YFTHTJAPODJVSL-UHFFFAOYSA-N 2-(1-benzothiophen-5-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane Chemical compound O1C(C)(C)C(C)(C)OB1C1=CC=C(SC=C2)C2=C1 YFTHTJAPODJVSL-UHFFFAOYSA-N 0.000 claims 21
- CMMASGVZWZQOEY-UHFFFAOYSA-N 1-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]ethanone Chemical compound CC(=O)C1=CC=CC(B2OC(C)(C)C(C)(C)O2)=C1 CMMASGVZWZQOEY-UHFFFAOYSA-N 0.000 claims 1
- AMCNFVSNMCENAB-UHFFFAOYSA-N 2-(1,3,2-dioxaborolan-2-yl)-1,3-thiazole Chemical compound O1CCOB1C1=NC=CS1 AMCNFVSNMCENAB-UHFFFAOYSA-N 0.000 claims 1
- OJOJHMBTQRIMQJ-UHFFFAOYSA-N 2-(2,4,6-trimethylphenyl)-1,3,2-dioxaborolane Chemical compound CC1=CC(C)=CC(C)=C1B1OCCO1 OJOJHMBTQRIMQJ-UHFFFAOYSA-N 0.000 claims 1
- RCCYMBKXLWUXTG-UHFFFAOYSA-N 2-(2,4-dimethylphenyl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane Chemical compound CC1=CC(C)=CC=C1B1OC(C)(C)C(C)(C)O1 RCCYMBKXLWUXTG-UHFFFAOYSA-N 0.000 claims 1
- SKQNWSBNAIOCOC-UHFFFAOYSA-N 2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzonitrile Chemical compound O1C(C)(C)C(C)(C)OB1C1=CC=CC=C1C#N SKQNWSBNAIOCOC-UHFFFAOYSA-N 0.000 claims 1
- KMHWSWITVAWIEB-UHFFFAOYSA-N 2-(4-methoxy-3-methylphenyl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane Chemical compound C1=C(C)C(OC)=CC=C1B1OC(C)(C)C(C)(C)O1 KMHWSWITVAWIEB-UHFFFAOYSA-N 0.000 claims 1
- SAWJXFQIAPLBEA-UHFFFAOYSA-N 2-(4-tert-butylphenyl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane Chemical compound C1=CC(C(C)(C)C)=CC=C1B1OC(C)(C)C(C)(C)O1 SAWJXFQIAPLBEA-UHFFFAOYSA-N 0.000 claims 1
- QHAYLPAKZXKQSE-UHFFFAOYSA-N 2-(5,5-dimethyl-1,3,2-dioxaborinan-2-yl)benzonitrile Chemical compound O1CC(C)(C)COB1C1=CC=CC=C1C#N QHAYLPAKZXKQSE-UHFFFAOYSA-N 0.000 claims 1
- RTYUBKQTFNAFQC-UHFFFAOYSA-N 3-(5,5-dimethyl-1,3,2-dioxaborinan-2-yl)benzonitrile Chemical compound O1CC(C)(C)COB1C1=CC=CC(C#N)=C1 RTYUBKQTFNAFQC-UHFFFAOYSA-N 0.000 claims 1
- SEARINNLCHQTJH-UHFFFAOYSA-N 4,4,5,5-tetramethyl-2-(3,4,5-trimethoxyphenyl)-1,3,2-dioxaborolane Chemical compound COC1=C(OC)C(OC)=CC(B2OC(C)(C)C(C)(C)O2)=C1 SEARINNLCHQTJH-UHFFFAOYSA-N 0.000 claims 1
- GCQADNWXVSTJQW-UHFFFAOYSA-N 4,4,5,5-tetramethyl-2-[4-(trifluoromethyl)phenyl]-1,3,2-dioxaborolane Chemical compound O1C(C)(C)C(C)(C)OB1C1=CC=C(C(F)(F)F)C=C1 GCQADNWXVSTJQW-UHFFFAOYSA-N 0.000 claims 1
- XDDLLUBKOZYOMY-UHFFFAOYSA-N 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzenesulfonamide Chemical compound O1C(C)(C)C(C)(C)OB1C1=CC=C(S(N)(=O)=O)C=C1 XDDLLUBKOZYOMY-UHFFFAOYSA-N 0.000 claims 1
- ITLDRNGUSKUMRG-UHFFFAOYSA-N 5,5-dimethyl-2-(2,4,6-trimethylphenyl)-1,3,2-dioxaborinane Chemical compound CC1=CC(C)=CC(C)=C1B1OCC(C)(C)CO1 ITLDRNGUSKUMRG-UHFFFAOYSA-N 0.000 claims 1
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 claims 1
- 229940125898 compound 5 Drugs 0.000 claims 1
- MENRMDAMYNTJKD-UHFFFAOYSA-N ethyl 4-methoxy-3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzoate Chemical compound CCOC(=O)C1=CC=C(OC)C(B2OC(C)(C)C(C)(C)O2)=C1 MENRMDAMYNTJKD-UHFFFAOYSA-N 0.000 claims 1
- 238000003402 intramolecular cyclocondensation reaction Methods 0.000 claims 1
- ANGKVUVZQVUVJO-UHFFFAOYSA-N n-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]acetamide Chemical compound C1=CC(NC(=O)C)=CC=C1B1OC(C)(C)C(C)(C)O1 ANGKVUVZQVUVJO-UHFFFAOYSA-N 0.000 claims 1
- WLPUWLXVBWGYMZ-UHFFFAOYSA-N tricyclohexylphosphine Chemical compound C1CCCCC1P(C1CCCCC1)C1CCCCC1 WLPUWLXVBWGYMZ-UHFFFAOYSA-N 0.000 claims 1
- UYUUAUOYLFIRJG-UHFFFAOYSA-N tris(4-methoxyphenyl)phosphane Chemical compound C1=CC(OC)=CC=C1P(C=1C=CC(OC)=CC=1)C1=CC=C(OC)C=C1 UYUUAUOYLFIRJG-UHFFFAOYSA-N 0.000 claims 1
- 125000002348 vinylic group Chemical group 0.000 claims 1
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 76
- 239000000243 solution Substances 0.000 description 67
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 56
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 50
- SCVFZCLFOSHCOH-UHFFFAOYSA-M potassium acetate Chemical compound [K+].CC([O-])=O SCVFZCLFOSHCOH-UHFFFAOYSA-M 0.000 description 45
- 239000000047 product Substances 0.000 description 38
- 229910052757 nitrogen Inorganic materials 0.000 description 29
- 238000004458 analytical method Methods 0.000 description 22
- HXITXNWTGFUOAU-UHFFFAOYSA-N phenylboronic acid Chemical compound OB(O)C1=CC=CC=C1 HXITXNWTGFUOAU-UHFFFAOYSA-N 0.000 description 22
- 235000011056 potassium acetate Nutrition 0.000 description 21
- 239000011541 reaction mixture Substances 0.000 description 19
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 18
- 239000012298 atmosphere Substances 0.000 description 17
- 150000001503 aryl iodides Chemical class 0.000 description 15
- 150000005347 biaryls Chemical group 0.000 description 14
- 229960004132 diethyl ether Drugs 0.000 description 11
- 238000003756 stirring Methods 0.000 description 11
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 10
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 10
- 125000000217 alkyl group Chemical group 0.000 description 10
- 229910052796 boron Inorganic materials 0.000 description 10
- FJDQFPXHSGXQBY-UHFFFAOYSA-L caesium carbonate Chemical compound [Cs+].[Cs+].[O-]C([O-])=O FJDQFPXHSGXQBY-UHFFFAOYSA-L 0.000 description 10
- 229910052799 carbon Inorganic materials 0.000 description 9
- 230000007062 hydrolysis Effects 0.000 description 9
- 238000006460 hydrolysis reaction Methods 0.000 description 9
- YWNJQQNBJQUKME-UHFFFAOYSA-N 2-bromo-5-methylpyridine Chemical compound CC1=CC=C(Br)N=C1 YWNJQQNBJQUKME-UHFFFAOYSA-N 0.000 description 8
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 8
- 125000002252 acyl group Chemical group 0.000 description 8
- 230000014759 maintenance of location Effects 0.000 description 8
- YCWSUKQGVSGXJO-NTUHNPAUSA-N nifuroxazide Chemical group C1=CC(O)=CC=C1C(=O)N\N=C\C1=CC=C([N+]([O-])=O)O1 YCWSUKQGVSGXJO-NTUHNPAUSA-N 0.000 description 8
- PTRATZCAGVBFIQ-UHFFFAOYSA-N Abametapir Chemical compound N1=CC(C)=CC=C1C1=CC=C(C)C=N1 PTRATZCAGVBFIQ-UHFFFAOYSA-N 0.000 description 7
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N diphenyl Chemical compound C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 description 7
- 239000003446 ligand Substances 0.000 description 7
- 238000002360 preparation method Methods 0.000 description 7
- 239000011734 sodium Substances 0.000 description 7
- ROFVEXUMMXZLPA-UHFFFAOYSA-N Bipyridyl Chemical group N1=CC=CC=C1C1=CC=CC=N1 ROFVEXUMMXZLPA-UHFFFAOYSA-N 0.000 description 6
- YLQBMQCUIZJEEH-UHFFFAOYSA-N Furan Chemical compound C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 6
- XYFCBTPGUUZFHI-UHFFFAOYSA-N Phosphine Chemical compound P XYFCBTPGUUZFHI-UHFFFAOYSA-N 0.000 description 6
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 6
- 125000003545 alkoxy group Chemical group 0.000 description 6
- 239000003153 chemical reaction reagent Substances 0.000 description 6
- IVDFJHOHABJVEH-UHFFFAOYSA-N pinacol Chemical compound CC(C)(O)C(C)(C)O IVDFJHOHABJVEH-UHFFFAOYSA-N 0.000 description 6
- 239000002244 precipitate Substances 0.000 description 6
- 239000000376 reactant Substances 0.000 description 6
- 241000894007 species Species 0.000 description 6
- 238000003786 synthesis reaction Methods 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 239000002253 acid Substances 0.000 description 5
- 125000003342 alkenyl group Chemical group 0.000 description 5
- 125000000304 alkynyl group Chemical group 0.000 description 5
- 150000001502 aryl halides Chemical class 0.000 description 5
- 229910000024 caesium carbonate Inorganic materials 0.000 description 5
- 238000004821 distillation Methods 0.000 description 5
- 239000000284 extract Substances 0.000 description 5
- 239000000706 filtrate Substances 0.000 description 5
- 125000000623 heterocyclic group Chemical group 0.000 description 5
- XMBWDFGMSWQBCA-UHFFFAOYSA-N hydrogen iodide Chemical compound I XMBWDFGMSWQBCA-UHFFFAOYSA-N 0.000 description 5
- 238000000746 purification Methods 0.000 description 5
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 5
- 239000011877 solvent mixture Substances 0.000 description 5
- IMRWILPUOVGIMU-UHFFFAOYSA-N 2-bromopyridine Chemical compound BrC1=CC=CC=N1 IMRWILPUOVGIMU-UHFFFAOYSA-N 0.000 description 4
- XOKDXPVXJWTSRM-UHFFFAOYSA-N 4-iodobenzonitrile Chemical compound IC1=CC=C(C#N)C=C1 XOKDXPVXJWTSRM-UHFFFAOYSA-N 0.000 description 4
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- KAESVJOAVNADME-UHFFFAOYSA-N Pyrrole Chemical compound C=1C=CNC=1 KAESVJOAVNADME-UHFFFAOYSA-N 0.000 description 4
- YTPLMLYBLZKORZ-UHFFFAOYSA-N Thiophene Chemical compound C=1C=CSC=1 YTPLMLYBLZKORZ-UHFFFAOYSA-N 0.000 description 4
- IPWKHHSGDUIRAH-UHFFFAOYSA-N bis(pinacolato)diboron Chemical compound O1C(C)(C)C(C)(C)OB1B1OC(C)(C)C(C)(C)O1 IPWKHHSGDUIRAH-UHFFFAOYSA-N 0.000 description 4
- 125000004432 carbon atom Chemical group C* 0.000 description 4
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 4
- 239000007795 chemical reaction product Substances 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 4
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- 229920000166 polytrimethylene carbonate Polymers 0.000 description 1
- WFIZEGIEIOHZCP-UHFFFAOYSA-M potassium formate Chemical compound [K+].[O-]C=O WFIZEGIEIOHZCP-UHFFFAOYSA-M 0.000 description 1
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 1
- 235000019394 potassium persulphate Nutrition 0.000 description 1
- 125000001844 prenyl group Chemical group [H]C([*])([H])C([H])=C(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 125000001325 propanoyl group Chemical group O=C([*])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000002577 pseudohalo group Chemical group 0.000 description 1
- CPNGPNLZQNNVQM-UHFFFAOYSA-N pteridine Chemical compound N1=CN=CC2=NC=CN=C21 CPNGPNLZQNNVQM-UHFFFAOYSA-N 0.000 description 1
- PBMFSQRYOILNGV-UHFFFAOYSA-N pyridazine Chemical compound C1=CC=NN=C1 PBMFSQRYOILNGV-UHFFFAOYSA-N 0.000 description 1
- 150000003222 pyridines Chemical group 0.000 description 1
- JWVCLYRUEFBMGU-UHFFFAOYSA-N quinazoline Chemical compound N1=CN=CC2=CC=CC=C21 JWVCLYRUEFBMGU-UHFFFAOYSA-N 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 239000012508 resin bead Substances 0.000 description 1
- 238000007363 ring formation reaction Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000007017 scission Effects 0.000 description 1
- 125000002914 sec-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 150000003335 secondary amines Chemical class 0.000 description 1
- 238000011894 semi-preparative HPLC Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- UYCAUPASBSROMS-UHFFFAOYSA-M sodium;2,2,2-trifluoroacetate Chemical compound [Na+].[O-]C(=O)C(F)(F)F UYCAUPASBSROMS-UHFFFAOYSA-M 0.000 description 1
- UYCAUPASBSROMS-AWQJXPNKSA-M sodium;2,2,2-trifluoroacetate Chemical compound [Na+].[O-][13C](=O)[13C](F)(F)F UYCAUPASBSROMS-AWQJXPNKSA-M 0.000 description 1
- KDNCILYKSYKEFJ-UHFFFAOYSA-N sodium;benzenesulfonyl(chloro)azanide Chemical compound [Na+].Cl[N-]S(=O)(=O)C1=CC=CC=C1 KDNCILYKSYKEFJ-UHFFFAOYSA-N 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 125000003696 stearoyl group Chemical group O=C([*])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000005156 substituted alkylene group Chemical group 0.000 description 1
- 125000003107 substituted aryl group Chemical group 0.000 description 1
- FDDDEECHVMSUSB-UHFFFAOYSA-N sulfanilamide Chemical compound NC1=CC=C(S(N)(=O)=O)C=C1 FDDDEECHVMSUSB-UHFFFAOYSA-N 0.000 description 1
- 125000000475 sulfinyl group Chemical group [*:2]S([*:1])=O 0.000 description 1
- 229940124530 sulfonamide Drugs 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 125000001973 tert-pentyl group Chemical group [H]C([H])([H])C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 150000003512 tertiary amines Chemical class 0.000 description 1
- CIHOLLKRGTVIJN-UHFFFAOYSA-N tert‐butyl hydroperoxide Chemical compound CC(C)(C)OO CIHOLLKRGTVIJN-UHFFFAOYSA-N 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 150000005621 tetraalkylammonium salts Chemical class 0.000 description 1
- CXWXQJXEFPUFDZ-UHFFFAOYSA-N tetralin Chemical compound C1=CC=C2CCCCC2=C1 CXWXQJXEFPUFDZ-UHFFFAOYSA-N 0.000 description 1
- GVIJJXMXTUZIOD-UHFFFAOYSA-N thianthrene Chemical compound C1=CC=C2SC3=CC=CC=C3SC2=C1 GVIJJXMXTUZIOD-UHFFFAOYSA-N 0.000 description 1
- 125000005425 toluyl group Chemical group 0.000 description 1
- ZQDPJFUHLCOCRG-AATRIKPKSA-N trans-3-hexene Chemical compound CC\C=C\CC ZQDPJFUHLCOCRG-AATRIKPKSA-N 0.000 description 1
- IAQRGUVFOMOMEM-ONEGZZNKSA-N trans-but-2-ene Chemical compound C\C=C\C IAQRGUVFOMOMEM-ONEGZZNKSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- BDZBKCUKTQZUTL-UHFFFAOYSA-N triethyl phosphite Chemical compound CCOP(OCC)OCC BDZBKCUKTQZUTL-UHFFFAOYSA-N 0.000 description 1
- 150000008648 triflates Chemical class 0.000 description 1
- JQKHNBQZGUKYPX-UHFFFAOYSA-N tris(2,4,6-trimethoxyphenyl)phosphane Chemical compound COC1=CC(OC)=CC(OC)=C1P(C=1C(=CC(OC)=CC=1OC)OC)C1=C(OC)C=C(OC)C=C1OC JQKHNBQZGUKYPX-UHFFFAOYSA-N 0.000 description 1
- CMLWFCUAXGSMBB-UHFFFAOYSA-N tris(2,6-dimethoxyphenyl)phosphane Chemical compound COC1=CC=CC(OC)=C1P(C=1C(=CC=CC=1OC)OC)C1=C(OC)C=CC=C1OC CMLWFCUAXGSMBB-UHFFFAOYSA-N 0.000 description 1
- 125000000297 undecanoyl group Chemical group O=C([*])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000002948 undecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000004417 unsaturated alkyl group Chemical group 0.000 description 1
- 238000003828 vacuum filtration Methods 0.000 description 1
- 125000003774 valeryl group Chemical group O=C([*])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 238000003809 water extraction Methods 0.000 description 1
- 238000010626 work up procedure Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D213/00—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members
- C07D213/02—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members
- C07D213/04—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom
- C07D213/06—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom containing only hydrogen and carbon atoms in addition to the ring nitrogen atom
- C07D213/22—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom containing only hydrogen and carbon atoms in addition to the ring nitrogen atom containing two or more pyridine rings directly linked together, e.g. bipyridyl
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D213/00—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members
- C07D213/02—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members
- C07D213/04—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom
- C07D213/06—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom containing only hydrogen and carbon atoms in addition to the ring nitrogen atom
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C231/00—Preparation of carboxylic acid amides
- C07C231/12—Preparation of carboxylic acid amides by reactions not involving the formation of carboxamide groups
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C303/00—Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides
- C07C303/02—Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides of sulfonic acids or halides thereof
- C07C303/22—Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides of sulfonic acids or halides thereof from sulfonic acids, by reactions not involving the formation of sulfo or halosulfonyl groups; from sulfonic halides by reactions not involving the formation of halosulfonyl groups
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D213/00—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members
- C07D213/02—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members
- C07D213/04—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom
- C07D213/60—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
- C07D213/62—Oxygen or sulfur atoms
- C07D213/69—Two or more oxygen atoms
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D317/00—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms
- C07D317/08—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3
- C07D317/44—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3 ortho- or peri-condensed with carbocyclic rings or ring systems
- C07D317/46—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3 ortho- or peri-condensed with carbocyclic rings or ring systems condensed with one six-membered ring
- C07D317/48—Methylenedioxybenzenes or hydrogenated methylenedioxybenzenes, unsubstituted on the hetero ring
- C07D317/50—Methylenedioxybenzenes or hydrogenated methylenedioxybenzenes, unsubstituted on the hetero ring with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to atoms of the carbocyclic ring
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D405/00—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom
- C07D405/02—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings
- C07D405/04—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings directly linked by a ring-member-to-ring-member bond
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F5/00—Compounds containing elements of Groups 3 or 13 of the Periodic Table
- C07F5/02—Boron compounds
- C07F5/022—Boron compounds without C-boron linkages
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F5/00—Compounds containing elements of Groups 3 or 13 of the Periodic Table
- C07F5/02—Boron compounds
- C07F5/025—Boronic and borinic acid compounds
Definitions
- This invention relates to a process for covalently coupling organic compounds, in particular to a process for covalently linking aromatic ring compounds via an organoboron intermediate to other organic compounds.
- the invention also relates to a process for the preparation of the organoboron intermediates.
- Substituted bi- and tri-aryl compounds are of great interest to the pharmaceutical and agrochemical industries. A great number of these compounds have been found to possess pharmaceutical activity, while others have been found to be useful herbicides. There is also interest from the polymer industry in polymers prepared by the linking together of aromatic ring compounds.
- the invention provides a process for covalently coupling organic compounds which comprises reacting an aromatic ring compound having a halogen or halogen-like substituent at a ring coupling position with a diboron derivative in the presence of a Group VIII metal catalyst and a suitable base.
- this process may be used to prepare a symmetrical product by reacting the diboron derivative with about two equivalents of aromatic ring compound.
- the coupling proceeds in two steps. In the first step the diboron derivative reacts with about one equivalent of aromatic ring compound in the presence of the Group VIII metal catalyst and suitable base to form an arylboron intermediate, which intermediate reacts in the presence of base with the remaining equivalent of aromatic ring compound.
- the covalent coupling comprises a covalent bond between ring coupling positions of two molecules of aromatic ring compound.
- the suitable base used to catalyse the reaction with the boron derivative is also able to catalyse the coupling of the arylboron intermediate to the remaining aromatic compound.
- a stronger base can be added after the formation of the arylboron intermediate to catalyse the coupling reaction.
- the process according to this embodiment allows the preparation of unsymmetrical compounds when the organic compound is different from the aromatic ring compound, although symmetrical products will be obtained if the organic compound is the same as the aromatic ring compound.
- the reaction is conducted in a single pot, although it is possible to isolate the arylboron intermediate prior to the final coupling step. If the reaction is conducted in a single pot it is preferred that the base added to decompose the diboron derivative is suitable for catalysing the coupling reaction. In this case there is no need to add further base with the organic compound in the coupling reaction.
- the excess diboron derivative may be decomposed by addition of mild oxidising agents following the formation of the arylboron intermediate.
- a process for covalently coupling organic compounds which comprises: reacting an aromatic ring compound having a halogen or halogen-like substituent at a ring coupling position with a diboron derivative in the presence of a Group VIII metal catalyst and a suitable base to form an arylboron intermediate;
- the mild oxidising agent may be any compound which will break the B-B bond of the diboron derivative but which is not strong enough to break boron-carbon bonds of the arylboron intermediate.
- Suitable mild oxidising agents are N-chlorosuccinimide, dimethyl dioxirange, dioxygen gas, chloramine-T, chloramine-B, 1-chlorotriazole, 1,3-dichloro- 5,5-dimethylhydantoin, trichloroisocyanuric acid and dichloroisocyanuric acid potassium salt.
- Oxidants such as hydrogen peroxide, ozone, bromine, t-butyl hydroperoxide, potassium persulphate, sodium hypochlorite and peracids, are too strong for use in this process; use of strong oxidants does not form part of this invention.
- aromatic ring compound(s) refers to any compound which includes or consists of one or more aromatic or pseudoaromatic rings.
- the rings may be carbocyclic or heterocyclic, and may be mono or polycyclic ring systems.
- suitable rings include but are not limited to benzene, biphenyl, terphenyl, quaterphenyl, naphthalene, tetrahydronaphthalene, 1-benzylnaphthalene, anthracene, dihydroanthracene, benzanthracene, dibenzanthracene, phenanthracene, perylene, pyridine, 4-phenylpyridine, 3-phenylpyridine, thiophene, benzothiophene, naphthothiophene, thianthrene, furan, pyrene, isobenzofuram, chromene, xanthene, phenoxathiin, pyrrole, imidazole, pyrazole, pyrazine, pyrimidine, pyridazine, indole, indolizine, isoindole, purine, quinoline, isoquinoline, phthalazine, quinox
- aromatic ring compound(s) includes molecules, and macromolecules, such as polymers, copolymers and dendrimers which include or consist of one or more aromatic or pseudoaromatic rings.
- pseudoaromatic refers to a ring system which is not strictly aromatic, but which is stablized by means of delocalization of ⁇ electrons and behaves in a similar manner to aromatic rings. Examples of pseudoaromatic rings include but are not limited to furan, thiophene, pyrrole and the like.
- organic compound having a halogen or halogen-like substituent at a coupling position refers to any organic compound having a carbon to halogen or carbon to halogen-like substituent bond at a position where coupling to the aromatic ring compound is desired.
- the organic compound may be aliphatic, olefinic, aromatic, polymeric or dendritic.
- the compound may be an aromatic ring compound as defined above or part of such an aromatic ring compound.
- the organic compound may have one or more, preferably between 1 and 6, halogen or halogen-like substituents at coupling positions.
- olefinic and olefinic compound refer to any organic compound having at least one carbon to carbon double bond which is not part of an aromatic or pseudo aromatic system.
- the olefinic compounds may be selected from optionally substituted straight chain, branched or cyclic alkenes; and molecules, monomers and macromolecules such as polymers and dendrimers, which include at least one carbon to carbon double bond.
- Suitable olefinic compounds include but are not limited to ethylene, propylene, but-1-ene, but-2-ene, pent-1-ene, pent-2-ene, cyclopentene, l-methylpent-2-ene, hex-1-ene, hex-2-ene, hex-3-ene, cyclohexene, hept-1- ene, hept-2-ene, hept-3-ene, oct-1-ene, oct-2-ene, cyclooctene, non-1-ene, non-4-ene, dec- 1-ene, dec-3-ene, buta-l,3-diene, penta-l,4-diene, cyclopenta-l,4-diene, hex-l,diene, cyclohexa-l,3-diene, cyclohexa-l,4-diene, cyclohepta-l,3,
- R, R 2 and R 3 are each independently selected from alkyl, alkenyl, alkynyl, aryl, heteroaryl, acyl, arylalkyl and heteroary alkyl, each of which may be optionally substituted: and cyano, isocyano, formyl, carboxyl, nitro, halo, alkoxy, alkenoxy, aryloxy, benzyloxy, haloalkoxy, haloalkenyloxy, haloaryloxy, nitroalkyl, nitroalkenyl, nitroalkynyl, arylamino, diary lamino, dibenzylamino, alkenylacyl, alkynylacyl, arylacyl, acylamino, diacylamino, acyloxy, alkylsulphonyloxy, arylsulphenyloxy, heterocycloxy, arylsulphenyl, carboalkoxy, carboaryloxy, alkyl
- Coupled position refers to a position on an aromatic ring compound at which coupling to an organic compound is desired.
- a coupling position on a ring of an aromatic ring compound is also referred to as a "ring coupling position”.
- the term “coupling position” also refers to a position on an organic compound at which coupling to an aromatic ring compound is desired.
- Each aromatic ring compound or organic compound may have one or more, preferably between 1 and 6, coupling positions.
- optionally substituted means that a group may or may not be further substituted with one or more groups selected from alkyl, alkenyl, alkynyl, aryl, halo, haloalkyl, haloalkenyl, haloalkynyl, haloaryl, hydroxy, alkoxy, alkenyloxy, aryloxy, benzyloxy, haloalkoxy, haloalkenyloxy, haloaryloxy, isocyano, cyano, formyl, carboxy 1, nitro, nitroalkyl, nitroalkenyl, nitroalkynyl, nitroaryl, nitroheterocyclyl, amino, alkylamino, dialkylamino, alkenylamino, alkynylamino, arylamino, diary lamino, benzylamino, imino, alkylimine, alkenylimine, alkynylimino, ary
- the aromatic ring compound must include at least one halogen or halogen-like substituent at a ring coupling position to enable reaction with the diboron derivative.
- the organic compound must have at least one halogen or halogen-like substituent at a coupling position to enable reaction with the arylboron intermediate.
- Preferred halogen substituents include I and Br. Cl may also be used although Cl is generally less reactive to substitution by the boron derivative or aryl boron intermediate. The reactivity of chloro substituted aromatic ring compounds can be increased by selection of appropriate ligands on the Group VIII metal catalyst.
- halogen-like substituent and "pseudo- halide” refer to any substituent which, if present on an aromatic ring, may undergo substitution with a diboron derivative in the presence of a Group VIII metal catalyst and base to give an arylboron intermediate, or if present on an organic compound may undergo substitution with an arylboron intermediate to give a coupled product.
- halogen-like substituents include triflates and mesylates, diazonium salts, phosphates and those described in Palladium Reagents & Catalysts (Innovations in Organic Synthesis by J. Tsuji, John Wiley & Sons, 1995, ISBN 0-471-95483-7).
- the process according to the invention is especially suitable for coupling aromatic ring compounds which have active hydrogen containing substituents on the aromatic ring(s) to be coupled.
- active hydrogen containing substituent refers to a substituent which contains a reactive hydrogen atom.
- substituents include but are not limited to hydroxy, amino, imino, acetyleno, carboxy (including carboxylato), carbamoyi, carboximidyl, sulfo, sulfinyl, sulfinimidyl, sulfinohydroximyl, sulfonimidyl, sulfondiimidyl, sulfonohydroximyl, sultamyl, phosphinyl, phosphinimidyl, phosphonyl, dihydroxyphosphanyl, hydroxyphosphanyl, phosphono (including phosphonato), hydrohydroxyphosphoryl, allophanyl, guanidino, hydantoyl, ureido, and ureylene.
- carboxy including carboxylato
- carbamoyi carboximidyl
- sulfo sulfinyl
- sulfinimidyl sulfin
- alkyl used either alone or in compound words such as “alkenyloxy alkyl”, “alkylthio”, “alkylamino” and “dialkylamino” denotes straight chain, branched or cyclic alkyl, preferably C ⁇ Q alkyl or cycloalkyl.
- straight chain and branched alkyl examples include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl, amyl, isoamyl, sec-amyl, 1,2-dimethylpropyl, 1,1-dimethyl-propyl, hexyl, 4- methylpentyl, 1-methylpentyl, 2-methylpentyl, 3-methylpentyl, 1 ,1-dimethylbutyl, 2,2- dimethylbutyl, 3,3-dimethylbutyl, 1,2-dimethylbutyl, 1,3-dimethylbutyl, 1,2,2,- trimethylpropyl, 1,1,2-trimethylpropyl, heptyl, 5 -methoxy hexyl, 1-methylhexyl, 2,2- dimethylpentyl, 3,3-dimethylpentyl, 4,4-dimethylpentyl, 1,2-dimethyl
- cyclic alkyl examples include mono- or polycyclic alkyl groups such as cyclop ropy 1, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, cyclononyl, cyclodecyl and the like.
- alkoxy denotes straight chain or branched alkoxy, preferably alkoxy. Examples of alkoxy include methoxy, ethoxy, n-propoxy, isopropoxy and the different butoxy isomers.
- alkenyl denotes groups formed from straight chain, branched or cyclic alkenes including ethylenically mono-, di- or poly-unsaturated alkyl or cycloalkyl groups as previously defined, preferably C2.20 alkenyl.
- alkenyl examples include vinyl, allyl, 1- methylvinyl, butenyl, iso-butenyl, 3-methyl-2-butenyl, 1-pentenyl, cyclopentenyl, 1- methyl-cyclopentenyl, 1-hexenyl, 3-hexenyl, cyclohexenyl, 1-heptenyl, 3-heptenyl, 1- octenyl, cyclooctenyl, 1-nonenyl, 2-nonenyl, 3-nonenyl, 1-decenyl, 3-decenyl, 1,3- butadienyl, l-4,pentadienyl, 1,3-cyclopentadienyl, 1,3-hexadienyl, 1,4-hexadienyl, 1,3- cyclohexadienyl, 1,4-cyclohexadienyl, 1,3-cycloheptadienyl, 1,3,5-cycl
- alkynyl denotes groups formed from straight chain, branched or cyclic alkyne including alkyl and cycloalkyl groups as previously defined which contain a triple bond, preferably C2_2f j alkynyl.
- alkynyl include ethynyl, 2,3-propynyl and 2,3- or 3,4-butynyl.
- acyl either alone or in compound words such as “acyloxy”, “acylthio", “acylamino” or “diacylamino” denotes carbamoyi, aliphatic acyl group and acyl group containing an aromatic ring, which is referred to as aromatic acyl or a heterocyclic ring which is referred to as heterocyclic acyl, preferably C ⁇ Q acyl.
- acyl examples include carbamoyi; straight chain or branched alkanoyl such as formyl, acetyl, propanoyl, butanoyl, 2-methylpropanoyl, pentanoyl, 2,2-dimethylpropanoyl, hexanoyl, heptanoyl, octanoyl, nonanoyl, decanoyl, undecanoyl, dodecanoyl, tridecanoyl, tetradecanoyl, pentadecanoyl, hexadecanoyl, heptadecanoyl, octadecanoyl, nonadecanoyl and icosanoyl; alkoxycarbonyl such as methoxycarbonyl, ethoxycarbonyl, t-butoxycarbonyl, t- pentyloxycarbonyl and heptyloxycarbonyl; cycloalkyl
- phenylacetyl phenylpropanoyl, phenylbutanoyl, phenylisobutylyl, phenylpentanoyl and phenylhexanoyl
- naphthylalkanoyl e.g. naphthylacetyl, naphthylpropanoyl and naphthylbutanoyl
- aralkenoyl such as phenylalkenoyl (e.g.
- phenylpropenoyl, phenylbutenoyl, phenylmethacryloyl, phenylpentenoyl and phenylhexenoyl and naphthylalkenoyl e.g. naphthylpropenoyl, naphthylbutenoyl and naphthylpentenoyl
- aralkoxycarbonyl such as phenylalkoxycarbonyl
- benzyloxycarbonyl aryloxycarbonyl such as phenoxycarbonyl and napthyloxycarbonyl; aryloxyalkanoyl such as phenoxy acetyl and phenoxypropionyl; arylcarbamoyl such as phenylcarbamoyl; arylthiocarbamoyl such as phenylthiocarbamoyl; arylglyoxyloyl such as phenylglyoxyloyl and naphthylglyoxyloyl; arylsulfonyl such as phenylsulfonyl and napthylsulfonyl; heterocycliccarbonyl; heterocyclicalkanoyl such as thienylacetyl, thienylpropanoyl, thienylbutanoyl, thienylpentanoyl, thienylhexanoyl, thiazoly
- heterocyclic refers to aromatic, pseudo-aromatic and non-aromatic rings or ring systems which contain one or more heteroatoms selected from N, S, O and P and which may be optionally substituted.
- the rings or ring systems have 3 to 20 carbon atoms.
- the rings or ring systems may be selected from those described above in relation to the definition of "aromatic ring compound(s)".
- aryl as used herein on its own or as part of a group such as “haloaryl” and “aryloxycarbonyl” refers to aromatic and pseudo-aromatic rings or ring systems composed of carbon atoms, optionally together with one or more heteroatoms. Preferably the rings or ring systems have between 3 and 20 carbon atoms. The rings or ring systems may be optionally substituted and may be selected from those described above in relation to the definition of "aromatic ring compound(s)".
- the diboron derivative may be an ester or other stable derivative of diboronic acid.
- suitable esters include those of the formula (RO) 2 B-B(RO) 2 where R is optionally substituted alkyl or optionally substituted aryl or -B(OR) 2 represents a cyclic group of formula
- R is optionally substituted alkylene, arylene or other divalent group comprising linked aliphatic or aromatic moieties.
- Preferred diboron derivatives include the pinacol ester of diboronic acid, bis(ethanediolato)diboron, bis( «-propanediolato)diboron and bis(neopentanediolato)diboron. Some of the diboron derivatives will be more readily amenable to subsequent hydrolysis than others and may allow for the use of milder reaction conditions. Furthermore, judicious choice of the diboron derivative used may facilitate control over the reaction products formed.
- the diboron ester derivatives may be made following the method of Brotherton et al. [R.J. Brotherton, A.L.
- Group VIII metal catalyst refers to a catalyst comprising a metal of Group 8 of the periodic table described in Chemical and Engineering News, 63(5), 27, 1985.
- metals include Ni, Pt and Pd.
- the catalyst is a palladium catalyst as described below, although analogous catalysts of other Group VIII metals may also be used.
- suitable Ni catalysts include nickel black, Raney nickel, nickel on carbon and nickel clusters.
- the palladium catalyst may be a palladium complex.
- suitable palladium catalysts include but are not limited to PdCl 2 , Pd(OAc) 2 , PdCl 2 (dppf)CH 2 Cl 2 , Pd(PPh 3 ) 4 , Pd(Ph 2 P(CH 2 ) n PPh 2 ) where n is 2 to 4 and related catalysts which are complexes phosphine ligands, (such as P(o-tolyl) 3 , P(i-Pr) 3 , P(cyclohexyl) 3 , P(o-MeOPh) 3 , P(p- MeOPh) 3 , dppp, dppb, TDMPP, TTMPP, TMPP, TMSPP and related water soluble phosphines), related ligands (such as triarylarsine, triarylantimony, triarylbismuth), phosphite ligands (such as
- the palladium catalysts include palladium and palladium complexes supported or tethered on solid supports, such as palladium on carbon, as well as palladium black, palladium clusters, palladium clusters containing other metals, and palladium in porous glass described in J. Li, A. W-H. Mau and C.R. Strauss, Chemical Communications, 1997, pl275.
- the same or different palladium catalysts may be used to catalyse different steps in the process. In certain reactions there are advantages in using ligands with altered basicity and/or steric bulk.
- the process may be performed in any suitable solvent or solvent mixture.
- suitable solvents include amides of the lower aliphatic carboxylic acids and lower aliphatic secondary amines, DMSO, aromatic hydrocarbons, nitromethane, acetonitrile, benzonitrile, ethers, polyethers, cyclic ethers, lower aromatic ethers, lower alcohols, and their esters with the lower aliphatic carboxylic acids, pyridine, alkylpyridines, cyclic and the lower secondary and tertiary amines, and mixtures thereof, including mixtures with other solvents.
- the process is performed in a protic solvent.
- suitable protic solvents include water and lower alcohols. Most preferably the solvent is water, ethanol, methanol, isopropanol or mixtures thereof with other solvents. Particularly preferred solvents are ethanol and methanol. Strict exclusion of water from the solvents is generally not essential. The addition of further diboron derivative has been found useful when the solvents are not anhydrous.
- the temperature at which each step of the process according to the invention is conducted will depend on a number of factors including the desired rate of reaction, solubility and reactivity of the reactants in the selected solvent, boiling point of the solvent, etc.
- the temperature of the reaction will generally be in the range of -100 to 250 °C.
- the process is performed at a temperature between 0 and 120° C, more preferably between 0 and 80°C, and most preferably between 15 and 40°C.
- Suitable base refers to a basic compound which, when present in the reaction mixture, is capable of catalysing, promoting or assisting reaction between reactants.
- the base may be suitable for catalysing a single step, or more than one step, depending on the desired outcome of the reaction.
- a base may be chosen which catalyses reaction between the aromatic ring compound and the diboron derivative, but which is not strong enough to catalyse further reaction of aryl boron intermediate with additional aromatic ring compound or other organic ring compound.
- a stronger base and water may be added to decompose excess diboron derivative, and which may also catalyse reaction of the arylboron intermediate with the organic compound.
- a base is chosen which is soluble in the solvent to which it is added.
- bases which are suitable for catalysing the reaction of the aromatic ring compound with the diboron derivative include, aryl and alkyl carboxy lates (for example potassium acetate), fluorides, hydroxides and carbonates of Li, Na, K, Rb, Cs, ammonium, alkylammonium, Mg, Ca, & Ba; phosphates and arylphosphates of Li, Na, K, Rb and Cs; phosphate esters (eg.
- bases suitable for catalysing reaction of the aromatic ring compounds with the diboron derivative, without generally catalysing the further reaction of the arylboron intermediate include aryl and alkyl carboxylates and phosphates of Li, Na, K, Rb, Cs, ammonium and alkylammonium.
- bases suitable for decomposing excess diboron derivative and/or catalysing reaction of the arylboron intermediate include the stronger bases listed above, including caesium carbonate, potassium carbonate and alkali metal hydroxides.
- arylboron intermediate refers to the product of the Group VIII metal base catalysed reaction between an aromatic ring compound having a halogen or halogen-like substituent at a ring coupling position and a diboron derivative, the product including a carbon- to -boron bond at the ring coupling position.
- a process for preparing an arylboron intermediate comprising reacting a diboron derivative with an aromatic ring compound having a halogen or halogen-like substituent and an active hydrogen containing substituent in the presence of a Group VIII metal catalyst and a suitable base.
- a process for preparing an arylboron intermediate comprising reacting a diboron derivative with an aromatic ring compound having a halogen or halogen-like substituent in a protic solvent in the presence of a Group VIII metal catalyst and a suitable base.
- a first step in the purification of the arylboron intermediate so formed may be the decomposition of any excess diboron derivative by the use of water, water and base, or by the use of a mild oxidising agent.
- a process for the preparation of an aryl boronic acid including hydrogenolysing or hydrolysing the arylboron intermediate as hereinbefore described using established procedures.
- the ease of hydrolysis/hydrogenolysis is a function of the diboronic ester used.
- Some aryl boron intermediates are more amenable to hydrolysis/hydrogenolysis than those derived from the pinacol ester of diboronic acid. This method only relates to arylboron intermediates which are boronic esters.
- arylboron intermediates and aryl boronic acids are novel and represent a further aspect of the present invention.
- Examples of such novel aryl boron intermediates which may be prepared according to the present invention are listed in Table 2, while some known arylboron intermediates prepared in accordance with the present invention are listed in Table 1.
- linking group refers to any chain of atoms linking one aryl group to another.
- Examples of linking groups include polymer chains, optionally substituted alkylene group and any other suitable divalent group.
- the process according to the present invention is applicable to chemistry on solid polymer support or resin bead in the same manner as conventional chemistry is used in combinatorial chemistry and in the preparation of chemical libraries.
- a suitable organic compound having a halogen or halogen-like substituent at a coupling position which is chemically linked to a polymer surface may be reacted with an arylboron intermediate in the presence of a Group VIII metal catalyst and a suitable base to form a coupled product linked to the surface of the polymer. Excess reagents and by-products may then be washed away from the surface leaving only the reaction product on the surface. The coupled product may then be isolated by appropriate cleavage of the chemical link from the polymer surface.
- the process is also possible using the alternative strategy of reacting an aromatic ring or an aromatic ring compound having a halogen or halogen-like substituent linked to a polymer surface with a diboron derivative in the presence of a Group VIII metal catalyst and a suitable base to form an arylboron intermediate chemically linked to the polymer surface.
- This intermediate may then be reacted with an organic compound having a halogen or halogen-like substituent at a coupling position in the presence of a Group VIII metal catalyst and a suitable base to prepare the coupled product chemically linked to the polymer.
- Excess reactants and by-products may be removed by suitable washing and the coupled product may be isolated by chemically cleaving the link to the polymer.
- a polymer e.g. polystyrene
- a halogen or halogen-like substituent e.g. a polymer
- convert this functionalised surface to an arylboron surface by reaction of the functionalised polymer with a diboron derivative in the presence of a Group VIII metal catalyst and a suitable base.
- the arylboron surface may then be reacted with any suitable organic compound having a halogen or halogen-like substituent. If the aromatic ring compound contains other functional groups, for example carboxylic ester, they may be used as linker groups to further extend the chemical reactions applied to the polymer surface.
- polyaryl compounds or other polymers by reaction of aromatic ring compounds having more than one halogen or halogen-like substituent.
- aromatic ring compounds may be reacted with a diboron derivative in the presence of a Group VIII metal catalyst and a suitable base to form an arylboron intermediate having more than one boron functionality.
- These intermediates may be reacted with aromatic ring compounds or organic compounds having more than one halogen or halogen-like substituent to form a polymer. If the aromatic ring compound has three or more halogen or halogen-like substituents which react with the diboron derivative then it is possible to prepare dendritic molecules in accordance with the process of the present invention.
- the aromatic ring compound and the organic compound may be separate molecules or may be linked together such that the arylboron intermediate formed after reaction with the diboron derivative is able to react at a coupling position located elsewhere in the molecule so as to provide for an intramolecular reaction, such as a ring closure reaction.
- the process according to the invention allows intramolecular linking to occur between different aromatic rings bearing halogen or halogen-like substituents located at different parts of the molecule. Reaction of one halide substituent with a diboron ester to form an arylboron intermediate allows reaction of that intermediate with the halide substituent on the other ring to thereby link the aromatic rings.
- the process according to the invention is also useful for the preparation of reactive intermediates which are capable of taking part in further reactions or rearrangements.
- reactive intermediates may be the aryl boron intermediates or the coupled products.
- the aryl boron intermediates may take part in one or more of the palladium catalysed reactions of aryl boron compounds described by Miyaura and Suzuki in Chem. Rev. 1995, 95 2457-2483.
- the process according to the present invention allows the linking of aromatic rings and aromatic ring compounds to organic compounds in mild conditions and avoids the use of expensive, difficult to remove and/or toxic reagents and solvents.
- boron and boron compounds are generally non-toxic.
- the reactions may also be performed in relatively cheap solvents such as methanol and ethanol and, in view of the improved control over the reaction steps, it is envisaged that it would be possible to perform the reactions on an industrial scale.
- the process also allows the linking of aromatic rings which contain active hydrogen substituents without the need to protect those substituents during the reaction.
- the solution was filtered from the copious precipitate by suction filtration through a glass sinter funnel and the filtrate evaporated to dryness affording a white solid (3.12 g) whose nmr indicated it was the product along with some dimethylamine hydrochloride salt.
- the residual precipitate was extracted with hot benzene (2 x 200 ml) and the extracts filtered and evaporated to dryness affording a white solid (8.41 g, 72%) whose nmr showed indicated it was the desired product.
- the first crop (3.12 g) was extracted with hot benzene (60 ml) and the extract filtered and evaporated to dryness affording a white solid (2.23 g) whose nmr showed indicated it was the desired product.
- eso-hydrobenzoin 45.66 g; 0.213 mol was added to tetrakis(dimethylamino)diboron (21.09 g; 0.107 mol) in anhydrous diethyl ether (500 ml) contained in a 2-neck 1 L round bottom flask under nitrogen. The mixture was stirred magnetically under nitrogen and cooled in ice. A solution of hydrogen chloride in dry diethyl ether (150 ml of 2.85 M, 0.428 mol) was added from a pressure-equalising dropping funnel over 1 h and the mixture allowed to warm to room temperature with stirring overnight.
- This diboronic acid ester was prepared following the procedure described above for Example 1 using l-phenyl-l,2-ethanediol instead of neopentanediol. Yield, 73%.
- 'H nmr (CDCl,, 200MHz): ⁇ 4.04-4.12 (triplet, 2H; 2 x HCHCPh), 4.57-4.66 (triplet, 2H; HCHCPh), 5.44- 5.52 (triplet, 2H; 2 x OCHPh) and 7.28-7.42 ppm (multiplet, 10H; 2 x ArH).
- This diboronic ester was prepared following the procedure described above for Example 1 using 3,5-di-tert-butylcatechol instead of neopentanediol. Yield, 41 %.
- 'H nmr (CDCl,, 200 MHz): ⁇ 1.21-1.51 (multiplet, 36H; 12 x CH,) and 6.82-7.30 ppm (multiplet, 4H; 2 x ArH).
- F.W.: calc for C 28 H 40 B 2 O 4 462.25, found m/z 463 (M+ l).
- arylboronic acid esters can be formed from aryl iodides and aryl bromides in aqueous ethanol.
- reaction mixture was filtered collecting a grey solid which was taken up in chloroform (25 ml). Some insoluble material was removed by suction filtration and the filtrate taken to dryness under vacuum to give a red-brown solid. Purification of this material by distillation under vacuum afforded a white solid at 80- 100°C/2.9xl0 2 atm.
- Examples 9 and 10 demonstrate that the neopentanediol ester of diborinic acid can also be used to form arylboronic acid esters, in methanol or isopropyl alcohol.
- Examples 9 and 11 demonstrate that the bis(neopentanediolato)diboron compound, when reacted with 4-iodobenzonitrile, produces less biaryl product than a similar reaction with the pinacol ester of diboronic acid.
- Example 12
- Examples 14 and 15 demonstrate that the bis(neopentanediolato)diboron compound, when reacted with 2-iodobenzonitrile, produces less biaryl product than a similar reaction with the pinacol ester of diboronic acid, indicating that choice of diboron ester derivative may allow control over the reaction products formed.
- Examples 17, 18 and 19 show that using other bases such as potassium benzoate, sodium fluoroacetate or sodium trifluoracetate in these reactions, instead of potassium acetate, also leads to the formation of the desired arylboronic acid ester.
- bases such as potassium benzoate, sodium fluoroacetate or sodium trifluoracetate
- the resin was washed 5 times with a solution of 0.5 % sodium dimethyldithiocarbamate and 0.5 % diisopropylamine in AR dimethylformamide, using an ultrasonic bath. The resin was washed several times with tetrahydrofuran followed by several washes with a dioxane-water mixture before being dried under vacuum (50 ⁇ C/28 in Hg) overnight.
- Example 22 Aryl borate formation using phenyl triflate
- a single peak was detected at 5.8 minutes. This peak was confirmed to be due to phenylboronic acid by spiking the solution with an authentic sample.
- Examples 23 and 24 show that although hydrolysis of the phenyl boronates of pinacol and neopentanediol in water does occur, the phenyl boronate of pinacol is more stable.
- the product was distilled as a colourless liquid at 70-75 °C, 3 x 10- 7 mm Hg.
- the aromatic protons indicate the presence of the para-substituted compound (AB type quartet; 7.64, 7.68, 7.81, 7.85 ppm) and the meta-substituted compound (7.36 (tr), 7.75 (d), 7.90 (d), 8.10 (s)).
- the gc of the material gave two peaks of near equal area and both compounds represented by these peaks gave a parent ion mass of 325 (M + 1) in the gc/ms.
- 2-bromo-5-methylpyridine can be readily carried out with bases such as Cs 2 CO, or C 6 H 5 OP(O)(ONa) 2 .H 2 O in ethanol. Pyridine can also be used. Examples are given with PdCl 2 (dppf).CH 2 Cl 2 or palladium acetate as catalyst. Reaction temperatures used varied from 50°C to 80°C.
- the reaction was left for 90 h at 60°C after which only 5,5'-dimethyl-2,2'-bipyridine was detected in the gc of the ether solution of an ether/water extracted sample of the reaction solution gave only two peaks, a weak one of retention time characteristic of the starting bromopyridine and the other peak had a retention time characteristic of the 5,5'-dimethyl-2,2'-bipyridine.
- the reaction was left for 65 h at 80°C after which the only peaks detected in the gc, of the ether solution of an ether/water extracted sample of the reaction solution, were 3,3'-dimethyl-2,2'-bipyridine (gc/ms, m/z 185, M + l) and the pinacol ester of diboronic acid.
- the gc of the ether solution of the ether/water extracted reaction solution showed that the reagents had been exhausted and the main peaks besides that of the phosphine were 2,2'- bipyridine (gc/ms; m/z 157, M + l) and ⁇ -anisylboronic acid pinacol ester (gc/ms, m/z 235, M+ l). 2,2'-bipyridine is also formed when HCOOK is used as base.
- This reaction can also be carried out using tris-2,4,6-trimethoxyphenyl- phosphine instead of the tri-p-tolylphosphine.
- the product was identified by gc/ms (m/z 157, M + l).
- An adjacent peak (m/z 169, M + l) was assigned to the phosphine derived species, 1,3,5-trimethoxybenzene.
- Example 33 A solution of l-bromo-3,4-methylenedioxybenzene (0.20 g; 0.99 mmol), the pinacol ester of diboronic acid (0.56 g; 2.2 mmol), disodium phenyl phosphate (0.47 g; 2.2 mmol), PdCl 2 (dppf).CH 2 Cl 2 (25 mg; 0.031 mmol) and internal standard biphenyl (0.15 g; 0.97 mmol) in methanol (5 ml) was heated between 30 and 50 °C till no aryl bromide was detected by gc analysis. N-Chlorosuccinimide (0.27 g; 2.0 mmol) was added and the reaction mixture stirred at room temperature. After 1 h gc analysis shows no diboron compound.
- Examples 33 and 34 show that N-chlorosuccinimide and dimethyldioxirane can decompose the excess pinacol ester of diboronic acid in the presence of an arylboronic acid ester.
- This reaction demonstrates the utility of ethanol in the formation of symmetric diaryls.
- the reaction was carried out at 40 °C, but lower temperatures could be employed.
- the tube was cooled, the crown removed and washed by immersion as above and air dried.
- the product was then cleaved from the crown by immersion in trifluoroacetic acid (600 ⁇ l) in a titre tube and the acid evaporated under a nitrogen stream.
- This example demonstrates performance of the reaction on a polymer support.
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Abstract
Description
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AU68134/98A AU716306B2 (en) | 1997-04-09 | 1998-04-09 | Aryl borates |
MX9909255A MX9909255A (en) | 1997-04-09 | 1998-04-09 | Process for covalently coupling organic compounds utilizing diboron derivatives for preparation of an aryl boronic acid |
JP54215298A JP2002505663A (en) | 1997-04-09 | 1998-04-09 | Aryl borate ester |
NZ337951A NZ337951A (en) | 1997-04-09 | 1998-04-09 | Process for covalently coupling organic compounds utilizing diboron derivatives for preparation of an aryl boronic acid |
EP98913437A EP0986541A4 (en) | 1997-04-09 | 1998-04-09 | Process for covalently coupling organic compounds utilizing diboron derivatives |
CA002285455A CA2285455A1 (en) | 1997-04-09 | 1998-04-09 | Process for covalently coupling organic compounds utilizing diboron derivatives |
KR19997009288A KR20010006208A (en) | 1997-04-09 | 1998-04-09 | Process for covalently coupling organic compounds utilizing diboron derivates |
US09/215,319 US6399779B1 (en) | 1997-04-09 | 1998-12-18 | Aryl borates |
US10/150,955 US6559310B2 (en) | 1997-04-09 | 2002-05-21 | Aryl borates |
US10/378,844 US6939985B1 (en) | 1997-04-09 | 2003-03-05 | Aryl borates |
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AUPO6096A AUPO609697A0 (en) | 1997-04-09 | 1997-04-09 | Process for coupling aromatic ring compounds |
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AUPO7479 | 1997-06-20 | ||
AUPO7479A AUPO747997A0 (en) | 1997-06-20 | 1997-06-20 | Alryl borates |
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Also Published As
Publication number | Publication date |
---|---|
US6559310B2 (en) | 2003-05-06 |
CA2285455A1 (en) | 1998-10-15 |
EP0986541A4 (en) | 2002-08-14 |
MX9909255A (en) | 2000-06-01 |
US6399779B1 (en) | 2002-06-04 |
JP2002505663A (en) | 2002-02-19 |
CN1255123A (en) | 2000-05-31 |
KR20010006208A (en) | 2001-01-26 |
NZ337951A (en) | 2000-02-28 |
EP0986541A1 (en) | 2000-03-22 |
US20020193604A1 (en) | 2002-12-19 |
US20020032339A1 (en) | 2002-03-14 |
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