7-Chloro-1-ethyl-6-fluoro-4-oxo-1,4-dihydro-1,8-naphthyridine-3-carboxylic acid → 1-Ethyl-6-fluoro-7-[3-[(isopropylamino)methyl]pyrrolidin-1-yl]-4-oxo-1,8-naphthyridine-3-carboxylic acid

Participants

Reaction Steps

A near solution of 0.82 g (3.0 mmole) of 7-chloro-1-ethyl-6-fluoro-1,4-dihydro-4-oxo-1,8-naphthyridine-3-carboxylic acid and 1.4 g (10 mmole) of N-(2-propyl)-3-pyrrolidinemethanamine in 50 ml of acetonitrile was heated at reflux for one hour. The solvent was removed in vacuo, the residue dissolved in water, filtered through a fiber glass pad to clarify and the filtrate adjusted to pH 2.0 with 6 M hydrochloric acid. The resulting clear solution was lyophilized and the residue recrystallized from ethanol to give 200 mg of 1-ethyl-6-fluoro-1,4-dihydro-7-[3-[[(1-methylethyl)amino]methyl]-1-pyrrolidinyl]-4-oxo-1,8-naphthyridine-3-carboxylic acid, mp 302°-304° C. as the hydrochloride.

Provenance & Evidence