反应详情

温度

90 °C

To a solution of 2-amino-4-difluoromethyl-5-iodo-benzoic acid methyl ester (750 mg, 2.29 mmol) in dioxane (30 mL) were added 1-isopropyl-5-tributylstannanyl-1H-pyrazole (1.1 g, 1.2 equiv) and Pd(dppf)2Cl2 (187 mg, 0.1 equiv) and the resulting mixture was stirred at 90° C. for 18 h. Another portion of catalyst (0.1 equiv) was added and the mixture was stirred at 90° C. for an additional 6 h. The solvent was removed in vacuo to afford a dark oil. The crude product was purified by flash chromatography (silica gel, EtOAc/hexanes (0:100 to 30:70)) to provide the title compound as an off-white solid (380 mg, 54%). ES-MS: m/z 310.3 [M+H]+, rt 5.54 min.

1. stirringthe mixture was stirred at 90° C. for an additional 6 h
2. customThe solvent was removed in vacuo
3. customto afford a dark oil
4. customThe crude product was purified by flash chromatography (silica gel, EtOAc/hexanes (0:100 to 30:70))