PRODUCTION OF 3-AMINOPYRROLIDINE OR ITS SALT

PURPOSE:To obtain the titled compound useful as an intermediate for antibacterial agents of quinolinecarboxylic acid and naphthyridinecarboxylic acid by a simple operation industrially advantageously, by reacting a 1-alkoxycarbonyl-3- aminopyrrolidine with a mineral acid. CONSTITUTION:1mol compound shown by the formula I (R is lower alkyl) is reacted with about 5-50mol mineral acid such as conc. hydrochloric acid, conc. sulfuric acid, diluted sulfuric acid, etc. at 50-150 deg.C for 1-20hr, then, the reaction product is desalted usually or subjected to salt-forming reaction, to give 3-aminopyrrolidine useful as an intermediate for a compound (antibacterial agent) shown by the formula II (R is lower alkyl, lower alkenyl, or phenyl which may be replaced; X is CH, or N) or its salt advantageously without requiring catalytic reduction. The compound shown by the formula I can be produced by a well-known method from a compound shown by the formula IIIthrough a compound shown by the formula IV.