申请人:Sumitomo Chemical Company, Limited
公开号:EP0957089A1
公开(公告)日:1999-11-17
A method for racemization of an optically active N-substituted azetidine-2-carboxylic acid ester of the formula (1):
wherein * represents an asymmetric carbon atom,
R1 represents an optionally substituted aryl group, a saturated hydrocarbon group which may be substituted with an optionally substituted aryl group, or an unsaturated hydrocarbon group,
R2 represents a saturated hydrocarbon group which may be substituted, an optionally substituted unsaturated hydrocarbon group, an alkyloxycarbonyl group which may be substituted, an alkenyloxycarbonyl group, or an optionally substituted sulfonyl group,
which comprises heating the ester of the formula (1) at 100°C or higher or subjecting the ester to contact with a basic compound selected from an alkali metal hydride, an alkali metal alkoxide of a tertiary alcohol and an organic amine.
一种式(1)的具有光学活性的 N-取代氮杂环丁烷-2-羧酸酯的消旋化方法:
其中 * 代表不对称碳原子、
R1 代表任选取代的芳基、可被任选取代的芳基取代的饱和烃基或不饱和烃基、
R2 代表可被取代的饱和烃基、可被取代的不饱和烃基、可被取代的烷氧羰基、烯氧羰基或可被取代的磺酰基、
其中包括在 100°C 或更高温度下加热式(1)的酯,或使酯与选自碱金属氢化物、叔醇的碱金属烷氧化物和有机胺的碱性化合物接触。