反应详情

(Trimethylsilyl)diazomethane (2 M in hexanes, 1.47 mL, 2.93 mmol) was added to a solution of 4-cyano-2-ethoxybenzoic acid (280 mg, 1.47 mmol) in benzene (8.0 mL) and methanol (1.6 mL). The reaction was stirred for 1 h and then degassed with air for 30 min. Evaporation of the solvent and purification of the crude residue by flash column chromatography (silica gel, eluting with 0-20% ethyl acetate in hexanes) gave methyl 4-cyano-2-ethoxybenzoate as a yellow solid (218 mg, 71%).

1. customdegassed with air for 30 min
2. customEvaporation of the solvent and purification of the crude residue
3. washby flash column chromatography (silica gel, eluting with 0-20% ethyl acetate in hexanes)