Procédé de préparation et de séparation d'acides érythro- et thréo-2-hydroxy-3-butanoique
申请人:SUMIKA FINE CHEMICALS Co., Ltd.
公开号:EP1112990A1
公开(公告)日:2001-07-04
The present invention provides a method of producing easily and in a high yield a threo-2-hydroxy-3-nitrobutanoic acid compound or a mixture of a threo- and an erythro-2-hydroxy-3-nitrobutanoic acid compounds, this mixture having an erythro compound:threo compound ratio of about 1:1, which method includes reacting, in a solvent, a 2-hydroxy-3-nitrobutanoic acid compound having the formula (I)
wherein R is optionally substituted alkyl or optionally substituted aryl, with not less than 1 equivalent of a base to isomerize (i) the erythro compound into the threo compound, or (ii) the threo compound into the erythro compound, and a method for separating the erythro and the threo compounds easily and in a high yield. The separation method includes reacting the mixture of threo- and erythro-compounds with not more than 1 equivalent of potassium carbonate per threo compound in a solvent. According to the method of the present invention, useful pharmaceuticals can be produced easily in a high yield.
本发明提供了一种容易和高产率地生产苏铁-2-羟基-3-硝基丁酸化合物或苏铁-2-羟基-3-硝基丁酸化合物和赤式-2-羟基-3-硝基丁酸化合物的混合物的方法,这种混合物的赤式化合物∶苏铁化合物的比例约为1∶1,该方法包括在溶剂中使具有式(I)的2-羟基-3-硝基丁酸化合物与不少于1当量的碱反应,使(i)赤式化合物异构化为苏铁化合物,或(ii)苏铁化合物异构化为赤式化合物。
其中 R 是任选取代的烷基或任选取代的芳基,与不少于 1 个当量的碱反应,使(i)赤式化合物异构化成苏氨酸化合物,或(ii)苏氨酸化合物异构化成赤式化合物,以及一种易于高产率分离赤式化合物和苏氨酸化合物的方法。分离方法包括将苏氨酸化合物和赤藓红化合物混合物在溶剂中与每种苏氨酸化合物不超过 1 个当量的碳酸钾反应。根据本发明的方法,可以很容易地以高产率生产出有用的药物。