HCID 54470582, compound → (RS)-1-cyclopropyl-7-fluoro-8-[3-(4-methoxyphenyl)-1-piperazinyl]-4-oxo-1,4-dihydrobenzo [b][1,8]naphthyridine-3-carboxylic acid

Participants

Reaction Steps

(RS)-1-Cyclopropyl-7-fluoro-8-[3-(4-methoxyphenyl)-1-piperazinyl]-4-oxo-1,4-dihydrobenzo [b][1,8]naphthyridine-3-carboxylic acid was prepared under the conditions of Example 29, but starting with (RS)-1-cyclopropyl-3-ethoxycarbonyl-7-fluoro-8-[3-(4-methoxyphenyl)-1-piperazinyl]-4-oxo-1,4-dihydrobenzo[b][1,8]naphthyridine (1.5 g) in N aqueous potassium hydroxide (18.4 cc) and ethanol (18.4 cc). After 1 recrystallization in dimethylformamide (50 cc), (RS)-1-cyclopropyl-7-fluoro-8-[3-(4-methoxyphenyl)-1-piperazinyl]-4-oxo-1,4-dihydrobenzo [b][1,8]naphthyridine-3-carboxylic acid (1.5 g) is obtained in the form of a yellow solid, decomposing at 287° C.

Provenance & Evidence