HCID 13041128, compound → HCID 13041129, compound

Participants

Reaction Steps

A suspension of 10 g of 3-ethoxycarbonyl-1-ethyl-1,4-dihydro-7-methoxy-4-oxo-1,8-naphthyridine-6-diazonium tetrafluoroborate in 300 ml of xylene was heated under reflux for 30 minutes. After evaporation of the xylene, the residue was taken up in chloroform. The chloroform solution was washed with water and the solvent was distilled off. The crude product was chromatographed on silica gel with chloroform as an eluent to give 3.6 g of ethyl 1-ethyl-6-fluoro-1,4-dihydro-7-methoxy-4-oxo-1,8-naphthyridine-3-carboxylate, m.p. 181°-182° C.

Provenance & Evidence