The present invention relates to a method for preparing (−)-huperzine A. The method involves: allowing a mixture of (±)-huperzine A obtained from chemical synthesis and a chiral acid to form (±)-huperzine A chiral acid salt under suitable conditions; recrystallizing the chiral acid salt from an organic solvent and basifying with an alkali to obtain optically pure (−)-huperzine A. The method is convenient to operate and suitable for industrial production. The chemical purity and optical purity of (−)-huperzine A obtained by the method are each greater than 99.5%, satisfying the requirement for raw pharmaceutical purity in the pharmaceutical industry.
本发明涉及一种制备(−)-扶林辛A的方法。该方法包括:在适当条件下,使从
化学合成得到的(±)-扶林辛A与手性酸的混合物形成(±)-扶林辛A手性酸盐;从有机溶剂中重新结晶化手性酸盐,并用碱性物质碱化以获得光学纯的(−)-扶林辛A。该方法操作方便,适合工业生产。该方法获得的(−)-扶林辛A的
化学纯度和光学纯度均大于99.5%,满足制药行业
原料药纯度要求。