Process for the catalytic synthesis of biaryls and polymers from aryl compounds
View Patent ↗A process for producing organic substituted aromatic or heteroaromatic compounds including biaryl and biheteroaryl compounds in a two-step reaction. In the first step, the aromatic or heteroaromatic compound is borylated in a reaction comprising a borane or diborane reagent (any boron reagent where the boron reagent contains a B—H, B—B or B—Si bond) and an iridium or rhodium catalytic complex. In the second step, a metal catalyst catalyzes the formation of the organic substituted aromatic or heteroaromatic compound from the borylated compound and an electrophile such as an aryl or organic halide, triflate (OSO 2 CF 3 ), or nonaflate (OSO 2 C 4 F 9 ). The steps in the process can be performed in a single reaction vessel or in separate reaction vessels. The present invention also provides a process for synthesis of complex polyphenylenes starting from halogenated aromatic compounds.
1. A process for producing a substitute aromatic compound in one vessel, which comprises:
(a) reacting in a reaction mixture first aromatic organic compound selected from the group consisting of an aryl, a six membered heteroaromatic compound, and a five membered heteroaromatic compound with a borane selected from the group consisting of a borane with a B—H, B—B, and B—Si bond in the presence of a catalytically effective amount of an iridium or rhodium complex with three or more substituents, and an organic ligand selected from the group consisting of phosphorus, carbon, nitrogen, oxygen, and sulfur organic ligands to form an aromatic boron compound in the reaction mixture; and
(b) reacting the aromatic boron compound in the reaction mixture with a second aromatic organic compound selected from the group consisting of halide, triflate, and nonaflate in the presence of a catalytically effective, amount of a metal catalyst and in the presence of the iridium or rhodium, in the reaction mixture from step (a), wherein an aromatic group of the second aromatic organic compound is coupled to an aromatic group of the first aromatic organic boron compound to produce the substituted aromatic compound.
2. The process of claim 1 , wherein the three or more substituents excludes hydrogen.
3. The process of claim 1 wherein the iridium complex with the ligand is selected from the group consisting of (Cp*)Ir(H) 2 (Me 3 P), (Cp*)Ir(H)(BPin)(Me 3 P), (Cp*)Ir(H)(C 6 H 5 )(Me 3 P), (Ind)Ir(COD), (Ind)Ir(dppe), (MesH)Ir(BPin)(B(OR) 2 ) 2 , ((R 1 ) 3 P) 3 Ir(B(OR 2 ) 2 ) 3 , (R 1 ) 2 P) 2 Ir(BPin) 3 , (((R 1 ) 2 P) 3 Ir((R 2 O) 2 B) 3 ) 2 , ((R 1 ) 3 P) 4 Ir(BPin), ((R 1 ) 3 P) 2 Ir(BPin) 3 , (MesH)Ir(BPin) 3 , and (IrCl(COD)) 2 , (PMe 3 ) 2 IrH 5 , ((R 1 ) 3 P) 2 IrH 5 , and ((R) 3 P) 2 IrH x (B(OR 2 ) 2 ) 5−x where x is 0-4, wherein Cp* is 1,2,3,4,5-methylcyclopentadienyl, BPin is pinacolborane, Me is methyl, H is hydrogen, P is phosphorus, Ind is indenyl, COD is 1,5-cyclooctadiene, MesH is mesitylene, and wherein R, R 1 , and R 2 are hydrogen, linear or branched alkyl containing 1 to 8 carbons, aryl, or a carbon in a cyclic structure.
4. The process of claim 1 wherein the iridium complex is (Ind)Ir(COD) wherein Ind is indenyl and COD is 1,5-cyclooctadiene.
5. The process of claim 1 wherein the iridium complex with the ligand is (MesH)Ir(BPin) 3 wherein MesH is mesitylene and BPin is pinacolborane.
6. The process of claim 1 wherein the iridium complex is (IrCl(COD) ) 2 wherein COD is 1,5-cyclooctadiene.
7. The process of claim 1 wherein the rhodium complex with the ligand is selected from the group consisting of (Cp*)Rh(H) 2 (Me 3 P), (Cp*)Rh(H)(BPin)(Me 3 P) (Cp*)Rh(H)(C 6 H 5 )(Me 3 P), and (Cp*)Rh(hexamethylbenzene), wherein Cp* is 1,2,3,4,5-methylcyclopentadienyl, BPin is pinacolborane, Me is methyl, H is hydrogen, and P is phosphorus.
8. The process of claim 1 or 2 wherein the phosphorus organic ligand is selected from the group consisting of trimethyl phosphine (PMe 3 ), 1,2-bis(dimethylphosphino)ethane (dmpe), Ph 3 P, Cy 3 P, and 1,2-bis(diphenylphosphino)ethane (dppe).
9. The process of claim 1 wherein the borane is a borane ester.
10. The process of claim 1 , wherein the borane is pinacolborane.
11. The process of claim 1 wherein the metal is palladium.
12. The process of claim 1 wherein the metal catalyst complex is selected from Pd(PPh 3 ) 4 , Pd 2 (dba) 3 /P( t Bu) 3 , PdCl 2 (dppf), and Pd(OAc) 2 /Cy 3 P wherein P is phosphorus and Ph is phenyl, dba is dibenzylideneacetone, t Bu is tert-butyl, dppf is diphenylphosphinoferrocene.
13. A process for producing an organic substituted aryl or heteroaryl compound, which comprises:
(a) reacting in a reaction mixture in a reaction vessel a first aromatic organic compound selected from the group consisting of an aryl, a six membered heteroaromatic compound, and a five membered heteroaromatic compound with a borane selected from the group consisting of a borane with a B—H, B—B and B—Si bond in the presence of a catalytically effective amount of an iridium or rhodium complex with three or more substituents, and an organic ligand selected from the group consisting of phosphorus, carbon, nitrogen, oxygen, and sulfur organic ligands to form an aromatic boron compound in the reaction mixture; and
(b) reacting the aromatic boron compound in the reaction mixture in the reaction vessel with a second aromatic organic compound selected from the group consisting of halide, triflate, and nonaflate in the presence of a catalytically effective amount of a metal catalyst and in the presence of the iridum or rhodium in the reaction mixture from step (a) wherein an aromatic group of the second aromatic organic compound is coupled to an aromatic group of the firs aromatic organic boron compound to produce the organic substituted aryl or heteroaryl compound.
14. The process of claim 13 wherein the three or more substituents excludes hydrogen.
15. The process of claim 13 wherein the iridium complex with the ligand is selected from the group consisting of (Cp*)Ir(H) 2 (Me 3 P), (Cp*)Ir(H)(BPin)(Me 3 P), (Cp*)Ir(H)(C 6 H 5 )(Me 3 P), (Ind)Ir(COD), (Ind)Ir(dppe), (MesH)Ir(BPin)(B(OR) 2 ), ((R 1 ) 3 P) 3 Ir(B(OR 2 ) 2 ) 3 , (R 1 ) 3 P) 2 Ir(BPin) 3 , (((R 1 ) 3 P) 3 Ir((R 2 O) 2 B) 3 ) 2 , ((R 1 ) 3 P) 4 Ir(BPin), ((R 1 ) 2 P) 3 Ir(BPin) 3 , (MesH)Ir(BPin) 3 , (PMe 3 ) 2 IrH 5 , ((R 1 ) 3 P) 2 IrH 5 , and ((R 1 ) 3 P) 2 IrH x (B(OR 2 ) 2 ) 5−x , where x is 0-4, (IrCl(COD)) 2 , wherein Cp* is 1,2,3,4,5-methylcyclopentadienyl, BPin is pinacolborane, Me is methyl, H is hydrogen, P is phosphorus, Ind is indenyl, COD is 1,5-cyclooctadiene, MesH is mesitylene, and wherein R, R 1 , and R 2 are hydrogen, linear or branched alkyl containing 1 to 8 carbons, aryl, or a carbon in a cyclic structure.
16. The process of claim 13 wherein the iridium complex is (Ind)Ir(COD) wherein Ind is indenyl and COD is 1,5-cyclooctadiene.
17. The process of claim 13 wherein the iridium complex with the ligand is (MesH)Ir(BPin) 3 wherein MesH is mesitylene and BPin is pinacolborane.
18. The process of claim 13 wherein the iridium complex is (IrCl(COD) ) 2 wherein COD is 1,5-cyclooctadiene.
19. The process of claim 13 wherein the rhodium complex is selected from the group consisting of (Cp*)Rh(H) 2 (Me 3 P), (Cp*)Rh(H)(BPin)(Me 3 P), (Cp*)Rh(H)(C 6 H 5 )(Me 3 P), and (Cp*)Rh(hexamethylbezene), wherein Cp* is 1,2,3,4,5-methylcyclopentadienyl, BPin is pinacolborane, Me is methyl, H is hydrogen, and P is phosphorus.
20. The process of claim 13 wherein the phosphorus organic ligand is selected from the group consisting of trimethyl phosphine (PMe 3 ), 1,2-bis(dimethylphosphino)ethane (dmpe), Ph 3 P, Cy 3 P, and 1,2-bis(diphenylphosphino)ethane (dppe).
21. The process of claim 13 wherein the borane is a borane ester.
22. The process of claim 13 wherein the borane is pinacolborane.
23. The process of claim 13 wherein the metal is palladium.
24. The process of claim 13 wherein the metal catalyst complex is selected from Pd(PPh 3 ) 4 , Pd 2 (dba) 3 /P( t Bu) 3 , PdCl 2 (dppf), and Pd(OAc) 2 /PCy 3 wherein P is phosphorus and Ph is phenyl, dba is dibenzylideneacetone, t Bu is tert-butyl, dppf is diphenylphosphinoferrocene.