申请人:CHINA NATIONAL MEDICINES GUORUI PHARMACEUTICAL CO., LTD.
公开号:US09079892B2
公开(公告)日:2015-07-14
A method for preparing a Rivaroxaban intermediate I is presented, including the following step: in a non-protonic solvent, under the effect of lewis acid, performing cyclization reaction on 4-(4-phenyl isocyanate)morpholine-3-ketone (II) and (S)-epoxy compound (III), the reaction temperature ranging from 20° C. to 60° C., where R is amino replaced by amino protecting group. The preparation method of the present invention has a mild condition, a simple process, a low cost, and high efficiency; the product is easy to purify and the method is applicable to industrial production.
本发明提供了一种制备利伐沙班中间体I的方法,包括以下步骤:在非质子溶剂中,在路易斯酸的作用下,对4-(4-苯基异氰酸基)吗啡酮-3-酮(II)和(S)-环氧化合物(III)进行环化反应,反应温度范围为20℃至60℃,其中R为氨基被氨基保护基取代。本发明的制备方法条件温和,工艺简单,成本低,效率高;产品易于纯化,方法适用于工业生产。