A one-pot process for the preparation of nateglinide, which process comprises reacting an alkyl ester of D-phenylalanine of formula (II):
where R represents C
1-4
alkyl, typically methyl, either as the free base or in salt form (typically the hydrochloride), with trans-4-isopropylcyclohexanecarboxylic acid of formula (III):
where X represents hydroxy or halo, typically chloro, to obtain a C
1-4
alkyl ester of nateglinide of formula (IV), preferably the methyl ester of nateglinide:
followed by hydrolysis to yield nateglinide of formula (I):
一种制备
那格列奈的一锅法工艺,该工艺包括将公式(II)的
D-苯丙氨酸烷基酯与反式-
4-异丙基环己烷羧酸反应,公式(II)中R代表C1-4烷基,通常为甲基,可以作为自由碱或盐形式(通常为盐酸盐),反应产生公式(IV)的C1-4烷基酯,首选
那格列奈的甲酯:然后
水解得到公式(I)的
那格列奈: