申请人:Takasago International Corporation
公开号:US06403804B1
公开(公告)日:2002-06-11
Disclosed is a process for preparing an optically active oxazolidinone derivative comprising 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.
揭示了一种制备光学活性噁唑烷酮衍生物的过程,包括允许双肼在具有3-位羟基的光学活性酯上发生反应,该酯由以下式表示(II):其中R1代表1至4个碳原子的较低烷基基团,苯基,甲氧甲基基团,苄氧甲基基团,苄氧羰氨甲基基团,其苯环上可能带有取代基或取代基,具有3至10个碳原子的酰胺基甲基基团,或具有3至6个碳原子的烷氧羰胺甲基基团;R2和R3,可以相同也可以不同,每个代表氢原子,1至4个碳原子的较低烷基基团,苯基,乙酰胺基甲基基团,苯甲酰胺基甲基基团,或苄基团;*表示一个不对称碳原子,并将得到的双肼衍生物进行Curtius重排。