Recombinant Baker's Yeast as a Whole-Cell Catalyst for Asymmetric Baeyer−Villiger Oxidations
作者:Jon D. Stewart、Kieth W. Reed、Carlos A. Martinez、Jun Zhu、Gang Chen、Margaret M. Kayser
DOI:10.1021/ja972942i
日期:1998.4.1
4-substituted cyclohexanones (R = Me, Et, n-Pr, i-Pr, allyl, n-Bu), almost all of which were oxidized to the corresponding e-caprolactones in good yields and high enantioselectivities (typically ≥ 95%). Mesomeric 4-substituted cyclohexanones were oxidized to e-caprolactones in ≥ 92% ee. The engineered yeast strain also effected kinetic resolutions of 2-substituted cyclohexanones with enantioselectivity values
来自不动杆菌属的环己酮单加氧酶 (EC 1.14.13.22)。NCIB 9871 已在面包酵母 (Saccharomyces cerevisiae) 中表达,以创建用于不对称 Baeyer-Villiger 氧化的通用试剂。这种“设计酵母”方法结合了使用纯化酶的优点(单一催化种类,无过度代谢等)和全细胞反应的优点(实验简单,无需辅因子再生等)。酵母试剂用于系统检测一系列2-、3-和4-取代的环己酮(R = Me、Et、n-Pr、i-Pr、烯丙基、n-Bu),几乎全部被氧化以良好的收率和高对映选择性(通常≥ 95%)转化为相应的ε-己内酯。内消旋 4-取代的环己酮在 ≥ 92% ee 中被氧化成ε-己内酯。工程酵母菌株还影响了 2-取代环己酮的动力学分辨率,对大于甲基的取代基的对映选择性值 ≥ 200。3-取代环的行为...