反应详情

5-tert-Butylsulfamoyl-4-chloro-2-ethoxybenzoic acid (0.8 g, 24 mmol) in 10 mL of tetrahydrofuran was treated with diazomethane (15 mL, ˜2-3 M in ether, prepared from N-methyl-N-nitroso-p-toluenesulfonamide, Aldrich) at room temperature and stirred for 0.5 h. The mixture was concentrated, and the residue was purified by flash chromatography (silica gel, eluting with 20% ethyl acetate in hexane) to give 0.45 g of 5-tert-butylsulfamoyl-4-chloro-2-ethoxybenzoic acid methyl ester as a solid.

1. concentrationThe mixture was concentrated
2. customthe residue was purified by flash chromatography (silica gel, eluting with 20% ethyl acetate in hexane)