[Cl:1][C:2]1[CH:7]=[C:6](I)[C:5]([Cl:9])=[CH:4][N:3]=1.[NH2:10][C:11]1[CH:19]=[CH:18][CH:17]=[CH:16][C:12]=1[C:13]([OH:15])=[O:14].C1(P(C2C=CC=CC=2)C2C=CC=CC=2OC2C=CC=CC=2P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.[O-]P([O-])([O-])=O.[K+].[K+].[K+]>C([O-])(=O)C.[Pd+2].C([O-])(=O)C>[Cl:1][C:2]1[CH:7]=[C:6]([NH:10][C:11]2[CH:19]=[CH:18][CH:17]=[CH:16][C:12]=2[C:13]([OH:15])=[O:14])[C:5]([Cl:9])=[CH:4][N:3]=1A mixture of 2,5-dichloro-4-iodopyridine (10 g, 36.5 mmol), 2-aminobenzoic acid (4.85 g, 35.4 mmol), DPEPhos [bis(2-diphenylphosphinophenyl)ether] (1.6 g, 2.97 mmol), palladium(II) acetate (160 mg, 0.713 mmol) and K3PO4 (20 g, 94 mmol) was degassed and heated at 120° C. (oil bath temp) for 20 h. After 20 h, LCMS showed there was 33% (relative to the desired product) starting material left. Added another 160 mg of Pd(OAc)2 to the mixture, and heated to 120° C. for another 24 h. LCMS showed conversion complete. The mixture was cooled to room temperature, followed by filtration, and washing with EtOAc. The solids were acidified to pH=7-8, followed by filtration. However, the mixture was a paste, and collected solids could not be dried completely. The solids (11 g) was acidified with 6N HCl to pH=1. The resulting paste was filtered, and washed with water and TBME. The solid was dried under vacuum over P2O5 for 2 days to give the title compound (7.32 g, 60.2% yield). MS: M(C12H8Cl2N2O2)=283.11, (M+H)+=283.8; 1H NMR (400 MHz, DMSO) ppm 13.6 (s, 1 H) 10.2 (s, 1 H) 8.3 (s, 1 H) 8.0 (d, 1 H) 7.6 (q, 2 H) 7.3 (s, 1 H) 7.2 (m, 1 H).
불러오는 중…
