作者:Joseph P. Sanchez、John W. Rogowski
DOI:10.1002/jhet.5570240139
日期:1987.1
1-Ethyl-6-fluoro-1,4-dihydro-7-methyl-4-oxo-1,8-naphthyridine-3-carboxylic acid (8) has been prepared in large quantities by a highly efficient process. It has in turn been degraded to give 7-chloro-1-ethyl-6-fluoro-1,4-dihydro-4-oxo-1,8-naphthyridine-3-carboxylic acid (11). This intermediate has been reacted with piperazine to give the known antibacterial agent, enoxacin (12).
通过高效方法大量制备了1-乙基-6-氟-1,4-二氢-7-甲基-4-氧代-1,8-萘啶-3-羧酸(8)。依次将其降解,得到7-氯-1-乙基-6-氟-1,4-二氢-4-氧代-1,8-萘啶-3-羧酸(11)。该中间体已经与哌嗪反应得到已知的抗菌剂依诺沙星(12)。