反应详情

A solution of 3-chloro-1-(4-chlorophenyl)-1,2-dihydroquinoxalin-2-one (7.7 g) and sodium methoxide (2.0 g) in methanol (70 ml) was refluxed for 4 hours. Water was added and the product was extracted into chloroform. Evaporation of the solvent followed by crystallization from ethanol gave the title compound (5.1 g) mp 245°-247° C.

1. extractionthe product was extracted into chloroform
2. customEvaporation of the solvent
3. customfollowed by crystallization from ethanol