反应详情

温度

28 °C

Methyl phenylpropiolate (methyl dehydrocinnamate (0.96 g, 6 mmol)) is dissolved in acetic anhydride (14 ml) and brought to the boiling temperature of acetic anhydride in a hot oil bath (140° C.). The total amount of 1-(4-fluorobenzoyl)pyrrolidine-2-carboxylic acid (1.42 g, 6 mmol) is added, and the thoroughly mixed solution is refluxed (1 28° C.) for 20 h with stirring. After standing for 4 hours and cooling to RT, a pure crystalline solid deposits (TLC: Al2O3, diisopropyl ether, Rf 0.7). The crystals are filtered off with suction, washed with water (20 ml) and finally with isopropyl ether (10 ml). The dried crystals weigh 650 mg (32.5% of theory)

1. custom(140° C.)
2. temperaturecooling to RT
3. filtrationThe crystals are filtered off with suction
4. washwashed with water (20 ml) and finally with isopropyl ether (10 ml)