申请人:Parthasaradhi Reddy Bandi
公开号:US20100197910A1
公开(公告)日:2010-08-05
The present invention provides a novel process for the preparation of the prulifloxacin intermediate, 6-fluoro-1-methyl-4-oxo-7-(1-piperazinyl)-4H-[1,3] thiazeto[3,2-a]quinoline-3-carboxylic acid, thereby producing prulifloxacin and its pharmaceutical acceptable acid addition salts thereof in high purity and in high yield using novel intermediates in lesser reaction time. Thus, for example, ethyl 6,7-difluoro-1-methyl-4-oxo-4H-[1,3]thiazeto[3,2-a]quinoline-3-carboxylate is reacted with boric acid in the presence of acetic anhydride and acetic acid to give a borane compound, which is then condensed with piperazine in the presence of acetonitrile and dimethylsulfoxide, followed by treatment with potassium hydroxide solution to give 6-fluoro-1-methyl-4-oxo-7-(1-piperazinyl)-4H-[1,3] thiazeto [3,2-a]quinoline-3-carboxylic acid.
本发明提供了一种新型工艺,用于制备普鲁利福昔中间体6-氟-1-甲基-4-氧代-7-(1-哌嗪基)-4H-[1,3]噻唑并[3,2-a]喹啉-3-羧酸,从而使用新型中间体在较短的反应时间内高纯度和高产率地生产普鲁利福昔及其药用可接受的酸盐。例如,乙酸乙酯6,7-二氟-1-甲基-4-氧代-4H-[1,3]噻唑并[3,2-a]喹啉-3-羧酸在乙酸酐和乙酸存在下与硼酸反应,得到硼烷化合物,然后在乙腈和二甲基亚砜存在下与哌嗪缩合,随后在氢氧化钾溶液的处理下得到6-氟-1-甲基-4-氧代-7-(1-哌嗪基)-4H-[1,3]噻唑并[3,2-a]喹啉-3-羧酸。