作者:Shangjin Yang、Walter Hayden、Kurt Faber、Herfried Griengl
DOI:10.1055/s-1992-26110
日期:——
Dimethyl (R)-(-)-citramalate (dimethyl 2-hydroxy-2-methylsuccinate, 4) was prepared in â 50% overall yield in four steps from ethyl chloro(hydroxyimino)acetate and ethyl methacrylate. The key transformation involved a regio- and enantiospecific hydrolysis of diethyl (RS)-5-methyl-4, 5-dihydroisoxazole-3,5-dicarboxylate (1a) using a protease from Aspergillus oryzae.
(R)-(-)-柠檬醛酸二甲酯(2-羟基-2-甲基琥珀酸二甲酯,4)由氯(羟基亚氨基)乙酸乙酯和甲基丙烯酸乙酯经四个步骤制备而成,总收率为§50%。关键的转化过程是利用一种来自黑曲霉的蛋白酶对 (RS)-5-甲基-4, 5-二氢异噁唑-3,5-二甲酸二乙酯 (1a) 进行区域和对映体特异性水解。