反应详情

A mixture of 4-(4-trifluoromethylphenyl)-2-oxazolone (10.8 g), methyl acrylate (8.10 g), boron trifluoride diethyl ether complex (6.86 g) and toluene (50 ml) was stirred with heating under reflux for 3 hours. The reaction mixture was concentrated, and poured into ice water (200 ml). The solid precipitates were filtered, washed with water, and air-dried. Recrystallization from isopropyl alcohol-isopropyl ether gave methyl 3-[2-oxo-4-(4-trifluoromethylphenyl)-4-oxazolin-5-yl]propionate as pale yellow prisms (4.00 g, 27%). Melting point 156-157° C.

1. temperaturewith heating
2. temperatureunder reflux for 3 hours
3. concentrationThe reaction mixture was concentrated
4. additionpoured into ice water (200 ml)
5. customThe solid precipitates
6. filtrationwere filtered
7. washwashed with water
8. customair-dried
9. customRecrystallization from isopropyl alcohol-isopropyl ether