(S)-4-HYDROXY-2-OXO-1-PYRROLIDINEACETAMIDE RACEMATE CRYSTAL FORM II AND PREPARATION METHOD THEREFOR
申请人:Ye Lei
公开号:US20140235871A1
公开(公告)日:2014-08-21
An (S)-4-hydroxy-2-oxo-1-pyrrolidine acetamide racemate referred to as (S)-oxiracetam crystal form II has a diffraction peak at a diffraction angle 2θ of 10.669, 13.25, 13.847, 14.198, 16.729, 17.934, 18.746, 18.816, 20.273, 20.413, 21.431, 21.617, 21.663, 23.38, 24.324, 24.415, 26.069, 26.107, 27.901, 28.621, 28.925, 29.449, 29.484, 31.702, 36.516, 37.685, or 39.721 degrees. The purity of the (S)-oxiracetam crystal form II can be up to 98.5%, and the (S)-oxiracetam crystal form II has the advantages of simple preparation method, mild control condition, low production cost, and the produced oxiracetam hydrate crystal form II has a high purity (the oxiracetam hydrate crystal form having a purity of 8%˜98.5% can be prepared by a crude levo-oxiracetam having a purity of 92%, and thus having a good reproducibility in production.
一种称为(S)-羟基-2-氧代-1-
吡咯烷乙酰胺外消旋体的晶型II,也称为(S)-奥西拉塔姆晶型II,在衍射角2θ为10.669、13.25、13.847、14.198、16.729、17.934、18.746、18.816、20.273、20.413、21.431、21.617、21.663、23.38、24.324、24.415、26.069、26.107、27.901、28.621、28.925、29.449、29.484、31.702、36.516、37.685或39.721度处具有衍射峰。 (S)-奥西拉塔姆晶型II的纯度可高达98.5%,并且(S)-奥西拉塔姆晶型II具有制备方法简单、控制条件温和、生产成本低等优点,所生产的奥西拉塔姆
水合物晶型II具有高纯度(奥西拉塔姆
水合物晶型的纯度为8%~98.5%可通过纯度为92%的粗左旋奥西拉塔姆制备,因此在生产中具有良好的再现性)。