Catalysed by the nitrile hydratase/amidase-containing Rhodococcus sp. AJ270 cells, a number of β-aryl- and β-alkyl- β-hydroxy-α-methylenepropiononitriles (the BaylisâHillman nitriles)
1 underwent hydrolysis under mild conditions to produce the corresponding enantiomerically enriched BaylisâHillman amides 2 and acids 3. The enantioselectivity of the biotransformations was strongly determined by the steric effect of the substituents at the β-position of the substrates. The protection of the free hydroxy of β-phenyl-β-hydroxy-α-methylenepropiononitrile 1a by methylation led to the enhancement of enantiocontrol of the biohydrolysis.
在含有腈
水解酶/酰胺酶的 Rhodococcus sp. AJ270 细胞催化下,一些δ-芳基和δ-烷基-δ-羟基-±-亚甲基
丙腈(BaylisâHillman 腈类)1 在温和条件下发生
水解,生成相应的对映体富集的 BaylisâHillman 酰胺 2 和酸 3。
生物转化的对映体选择性主要取决于底物δ-位上取代基的立体效应。通过甲基化保护δ-苯基-δ-羟基-δ-亚甲基
丙腈 1a 的游离羟基可增强
生物水解的对映体控制。