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.
本发明公开了一种制备光学活性
噁唑烷酮衍
生物的方法,包括让
肼在式(II)所代表的在3位具有羟基的光学活性酯上反应,其中R1代表具有1至4个碳原子的低级烷基、苯基、甲氧甲基、苄氧甲基、苄氧羰基
氨甲基基团,该基团上的苯环可能具有取代基,或者具有3至10个碳原子的酰
氨基甲基基团或3至6个碳原子的烷氧羰基
氨甲基基团;R2和R3,可以相同也可以不同,每个代表氢原子、具有1至4个碳原子的低级烷基、苯基、乙酰
氨基甲基基团、苯甲酰
氨基甲基基团或苄基;*表示不对称碳原子,并将得到的
肼酰
肼经过Curtius重排反应。