专利号:US-10358417-B2 优先权日:2016-05-06 标 题 :Method for preparing efficiently synthetic sitafloxacin intermediate (7S)-5-azaspiro[2.4]heptane-7-yl tert-butyl carbamate 发明人:LAI YINGJIE; YE DABING; LANG FENGRUI; LONG XIANGTIAN 权利人:CHEN STONE GUANGZHOU CO LTD 摘要:The present invention discloses a preparation method for efficient synthesis of sitafloxacin intermediate (7S)-5-azaspiro[2.4]heptane-7-yl-tert-butyl carbamate, comprising the following steps: reacting n nto obtainn n nreactingn n nto obtainn n nreactingn n nto obtainn n nand reactingn n nto obtainn n nIn the present invention, a single compound with a relatively high ee value can be obtained, the unnecessary waste of materials is avoided, the yield is significantly improved, the operation is simple, the industrial scale-up is easy, and the production cost is reduced.