反应详情

2-Amino-4-flourobenzothiazol (84 mg, 0.50 mmol) is dissolved in pyridine (3 ml) and treated with 4-dimethylaminopyridine (1 mg) and 5-methyl-thiophene-2-carbonyl chloride (161 mg, 1.0 mmol). After stirring for 1 h at ambient temperature, the reaction mixture was evaporated to dryness. Flash chromatography on silica (eluent diethyl ether/cyclohexane 1:1 containing 0.5% of 25% aqueous ammonia) and final recrystallization from ethyl acetate affords the product as off-white solid. (34 mg, 69%). MS: m/e=292 (M+).

1. customthe reaction mixture was evaporated to dryness
2. customFlash chromatography on silica (eluent diethyl ether/cyclohexane 1:1 containing 0.5% of 25% aqueous ammonia) and final recrystallization from ethyl acetate