Ethyl 7-chloro-6-fluoro-1-(1,2,4-thiadiazol-5-yl)-1,4-dihydro-4-oxo-1,8-naphthyridine-3-carboxylate → 7-Chloro-6-fluoro-1-(1,2,4-thiadiazol-5-yl)-1,4-dihydro-4-oxo-1,8-naphthyridine-3-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

Compound No. 164 (1.1 g) obtained in Example 99 was dissolved in a mixture of tetrahydrofuran (40 ml) and c-HCl (10 ml). The solution was stirred at 80° C. for 1.5 hour. After the solvent was removed in vacuo, the precipitate was filtrated and washed with ethanol, ether and n-hexane. The title compound No. 165 was obtained as a slightly yellow solid.

Provenance & Evidence