申请人:Takasago International Corporation
公开号:EP1008590A1
公开(公告)日:2000-06-14
A process for preparing an optically active oxazolidinone derivative
comprises allowing hydrazine to react on an optically active ester having a hydroxyl group at the 3-position which is represented by formula (II):
wherein R1 represents a lower alkyl group having 1 to 4 carbon atoms, a phenyl group, a methoxymethyl group, a benzyloxymethyl group, a benzyloxycarbonylaminomethyl group which may have a substituent or substituents on the benzene ring thereof, an acylaminomethyl group having 3 to 10 carbon atoms, or an alkyloxycarbonylaminomethyl group having 3 to 6 carbon atoms; R2 and R3, which may be the same or different, each represent a hydrogen atom, a lower alkyl group having 1 to 4 carbon atoms, a phenyl group, an acetylaminomethyl group, a benzoylaminomethyl group, or a benzyl group; and * indicates an asymmetric carbon atom,
and subjecting the resulting hydrazide to Curtius rearrangement.
一种制备光学活性噁唑烷酮衍生物的工艺
包括让肼与在 3 位上具有羟基的光学活性酯反应,该光学活性酯由式(II)表示:
其中 R1 代表具有 1 至 4 个碳原子的低级烷基、苯基、甲氧基甲基、苄氧基甲基、苄氧羰基氨基甲基(其苯环上可能有一个或多个取代基)、具有 3 至 10 个碳原子的酰基氨基甲基或具有 3 至 6 个碳原子的烷氧羰基氨基甲基;R2和R3可以相同或不同,各自代表氢原子、具有1至4个碳原子的低级烷基、苯基、乙酰氨基甲基、苯甲酰氨基甲基或苄基;*表示不对称碳原子、
并将所得酰肼进行 Curtius 重排。