反应详情

A mixture of ethyl 4-chloro-6-ethoxy-7-methyl-1,8-naphthyridine-3-carboxylate (3.1 g), 4-aminophenoxy-acetic acid hydrochloride (2.17 g) (prepared by reduction of 4-nitrophenoxyacetic acid using hydrogen and 10% palladium charcoal in a similar manner to Example C1 followed by treatment with 5M hydrochloric acid and then evaporation) and absolute ethanol (30 ml) was boiled under reflux for 4 hours. The mixture was cooled to ambient temperature and filtered to give ethyl 4-(6-ethoxy-3-ethoxycarbonyl-7-methyl-1,8-naphthyridin-4-ylamino)phenoxyacetate hydrochloride, m.p. 192°-194° C. Active (1/1) at 30 mg/kg.

1. customevaporation) and absolute ethanol (30 ml)
2. temperatureunder reflux for 4 hours
3. filtrationfiltered