Method for preparing efficiently synthetic sitafloxacin intermediate (7S)-5-azaspiro[2.4]heptane-7-yl tert-butyl carbamate
申请人:Chen-Stone (Guangzhou) Co., Ltd.
公开号:US10358417B2
公开(公告)日:2019-07-23
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
to obtain
reacting
to obtain
reacting
to obtain
and reacting
to obtain
In 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.
本发明公开了一种高效合成西他沙星中间体(7S)-5-氮杂螺[2.4]庚烷-7-基叔丁基氨基甲酸酯的制备方法,包括以下步骤:反应
得到
反应
以获得
反应
以获得
和反应
以获得
在本发明中,可以获得ee值相对较高的单一化合物,避免了不必要的材料浪费,显著提高了收率,操作简单,易于工业放大,降低了生产成本。