反应详情

A mixture of 3-acetoxybenzoic acid (8.1 mg, 0.0450 mmol), 5-aminomethylthiophene 18d (22.3 mg, 0.0473 mmol), 1-hydroxybenzotriazole (HOBt, 4.7 mg, 0.0348 mmol), and N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide (EDC, 8.5 mg, 0.0443 mmol) was dissolved in DMF (0.6 ml) and stirred overnight at r.t. Work-up (AcOEt/H2O; brine/Na2SO4), concentration, filtration over a silica gel plug (EtOAc) and evaporation gave the intermediate 3-acetoxybenzamide, which was deacetylated by siring in MeOH (2 ml) and Et3N (0.4 ml) for 1 h at 55° C. Evaporation gave 28.5 mg (103%) of the title 3-hydroxy-benzamide as a colorless oil.

1. concentration(AcOEt/H2O; brine/Na2SO4), concentration, filtration
2. customover a silica gel plug (EtOAc) and evaporation