反应详情

温度

120 °C

A mixture of bis(triphenylphosphine)palladium chloride (17.69 mg) was added to tert-butyl 4-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyrazol-1-yl]piperidine-1-carboxylate (380 mg), methyl 2-(2-amino-5-bromo-3-pyridyl)-1,3-benzoxazole-7-carboxylate (390 mg) and caesium fluoride (459 mg) dissolved in degassed methanol (5 ml) under argon. The resulting slurry was heated at 120° C. in the microwave for 30 minutes. The mixture was adsorbed on silica gel. The crude product was purified by flash chromatography on silica gel eluting with 1 to 4% methanol in dichloromethane. The solvent was evaporated to dryness to afford methyl 2-[2-amino-5-[1-(1-tert-butoxycarbonyl-4-piperidyl)pyrazol-4-yl]-3-pyridyl]-1,3-benzoxazole-7-carboxylate (365 mg) as a pale yellow solid. NMR Spectrum: (CDCl3) 1.49 (s, 9H), 1.97 (dd, 1H), 2.02 (dd, 1H), 2.16-2.23 (m, 2H), 2.84-3.01 (m, 2H), 4.06 (s, 3H), 4.19-4.40 (m, 3H), 6.88 (bs, 2H), 7.44 (dd, 1H), 7.70 (s, 1H), 7.80 (s, 1H), 7.94 (dd, 1H), 8.01 (dd, 1H), 8.40 (d, 1H), 8.48 (d, 1H); Mass spectrum: M+H+ 519;

1. customThe crude product was purified by flash chromatography on silica gel eluting with 1 to 4% methanol in dichloromethane
2. customThe solvent was evaporated to dryness