反应详情

A mixture of ethyl 4-chloro-6-ethoxy-7-methyl-1,8-naphthyridine-3-carboxylate (3.5 g) and 4-methoxyaniline (1.5 g) in ethanol (50 ml) was boiled under reflux for 1.5 hours. The reaction mixture was concentrated to half the volume, cooled and ether added. The solid was collected by filtration and dried to give ethyl 4-(4-methoxyanilino)-6-ethoxy-7-methyl-1,8-naphthyridine-3-carboxylate hydrochloride m.p. 260°-262° C. (with decomposition).

1. temperatureunder reflux for 1.5 hours
2. concentrationThe reaction mixture was concentrated to half the volume
3. temperaturecooled
4. additionether added
5. filtrationThe solid was collected by filtration
6. customdried