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 6M 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