专利号:WO-2012127505-A3 优先权日:2011-03-21 标题 :Improved process for the preparation of ciprofloxacin and its acid addition salts 发明人:DAVULURI RAMAMOHAN RAO; PONNAIAH RAVI; BAWANE SUNIL; PATHY ASHOK KUMAR; MALI SUNIL 权利人:DAVULURI RAMAMOHAN RAO 摘要:An improved process for the synthesis of 1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-7-(1-piperazinyl)-3-quinoline carboxylic acid (Ciprofloxacin) or and its acid addition salts preferablyhydrochloride salt with high yield and high purity, the process comprising of reacting 6-fluoro-7-chloro-1-cyclopropyl-4-oxo-1,4-dihydro-quinoline-3-carboxylic acid with piperazine in presence of a catalyst in an organic solvent.