Disclosed is a method for the synthesis of [(trans-4-isopropyl cyclohexyl)-carbonyl] D-phenylalanine (nateglinide) (formula I) including the steps of (i) reacting trans-4-isopropyl cyclohexyl carboxylic acid (formula (5)) with an alkyl chloroformate (formula (13)) where R represents an alkyl group, in a ketonic solvent in the presence of a base at a temperature in the range of -20° to 30°C to form the mixed anhydride of formula (14); and (ii) reacting said mixed anhydride with an aqueous alkali salt solution of Dphenylalanine to yield a reaction mixture including [(trans-4-isopropyl cyclohexyl)carbonyl]-D-phenylalanine.
本发明公开了一种合成[(trans-4-异丙基环己基)-羰基]
D-苯丙氨酸(
瑞格列奈)(式I)的方法,包括以下步骤:(i)在酮溶剂中,在碱存在下,将trans-4-异丙基环己基
羧酸(式5)与烷基
氯甲酸酯(式13)反应,其中R代表烷基,在-20℃至30℃的温度范围内形成式14的混合酸酐;(ii)将所述混合酸酐与
D-苯丙氨酸的
水溶性碱盐溶液反应,得到包括[(trans-4-异丙基环己基)羰基]-
D-苯丙氨酸的反应混合物。