反应详情

A 500 ml reaction flask equipped with a condenser, magnetic stirrer, thermometer and heating mantle was charged with 20.2 g (0.066 mole) of 4-bromo-4'-chloro-N-methylacetoacetanilide, 200 ml of ethanol and 5.4 g (0.071 mole) of thiourea. The reaction solution was refluxed for three hours. After cooling, about one-half of the solvent was removed on the rotary evaporator and the solution was poured into 300 ml of water. After adding sufficient ammonium hydroxide to pH 8, additional water was added. The precipitated crystalline product was dried in a vacuum oven. There was obtained 12.4 g (66.7%) of white material, M.P. 148°-50°. N.M.R. (dimethyl-d6 sulfoxide, CDCl3) ∂3.2 (NCH3), 3.3 (CH2), 6.0 (heteroaromatic), 7.3-7.5 (aromatic).

1. customA 500 ml reaction flask
2. customequipped with a condenser, magnetic stirrer
3. temperaturethermometer and heating mantle
4. temperatureThe reaction solution was refluxed for three hours
5. temperatureAfter cooling, about one-half of the solvent
6. customwas removed on the rotary evaporator
7. additionthe solution was poured into 300 ml of water
8. additionAfter adding sufficient ammonium hydroxide to pH 8, additional water
9. additionwas added
10. customThe precipitated crystalline product was dried in a vacuum oven