反应详情

A solution of 1-(4-chlorophenyl)-1,2-dihydro-3-hydroxyquinoxalin-2-one (20 g) in phosphorus oxychloride (64 ml) was refluxed for 4 hours and then poured slowly into iced water. The resulting solid was filtered off, triturated with pentane and dried giving the title compound (19.4 g) mp>300° C.

1. filtrationThe resulting solid was filtered off
2. customtriturated with pentane
3. customdried