A chemoenzymatic approach to the synthesis of enantiomerically pure aza analogues of paraconic acid methyl ester and both enantiomers of methyl β-proline
作者:Fulvia Felluga、Giuliana Pitacco、Massimo Prodan、Sabrina Pricl、Marco Visintin、Ennio Valentin
DOI:10.1016/s0957-4166(01)00523-7
日期:2001.12
Enantiopure methyl esters of 1-alkyl-5-oxo-3-pyrrolidinecarboxylic acids were obtained by enzymatic resolution of the corresponding chiral racemic mixtures. A particularly favourable interaction, also supported by molecular mechanics calculations, was observed between the 1-benzyl derivative and α-chymotrypsin, for which the enantiomeric ratio, E, exceeded 200. The absolute configurations of the lactams
通过酶促拆分相应的手性外消旋混合物,获得1-烷基-5-氧代-3-吡咯烷羧酸的对映体纯甲酯。在1-苄基衍生物和α-胰凝乳蛋白酶之间观察到特别有利的相互作用,这也得到分子力学计算的支持,其对映体比率E超过200。内酰胺的绝对构型是通过CD光谱法确定的。从所得对映体纯的(99%ee)(S)-(+)-1-苄基-3-吡咯烷羧酸和(R)-(-)-1-苄基-3-吡咯烷甲酸甲酯,(+ )和(-)-β-脯氨酸的合成产率分别为99%ee和18%和22%。