反应详情

To a solution of 4-amino-2-chlorobenzoic acid methyl ester hydrochloride (0.52 g) and DIEA (0.27 mL) in CH2Cl2 (20 mL) at 0° C. under N2 was added 4-chlorobutyryl chloride (0.3 mL) and the mixture was stirred for 4 h at that temperature. DMAP (0.23 mmol) was added and the mixture was stirred at room temperature overnight. 4-Chlorobutyryl chloride (0.3 mL) and DIEA (0.09 mL) were added and the mixture was stirred for 24 h. The mixture was diluted with CH2Cl2 (100 mL) and the solution was washed successively with 1N HCl, std. NaHCO3, brine, dried and evaporated. The residue was purified by column chromatography (silica gel; eluent: hexane/EtOAc 3:1) to yield 4-(4-chlorobutyryl)amino-2-chlorobenzoic acid methyl ester (0.64 g). ESMS: m/z 290 (MH+).

1. stirringthe mixture was stirred at room temperature overnight
2. stirringthe mixture was stirred for 24 h
3. washthe solution was washed successively with 1N HCl, std
4. dry with materialNaHCO3, brine, dried
5. customevaporated
6. customThe residue was purified by column chromatography (silica gel; eluent: hexane/EtOAc 3:1)