Biocatalytic Asymmetric Rearrangement of a Methylene-Interrupted Bis-epoxide: Simultaneous Control of Four Asymmetric Centers Through a Biomimetic Reaction Cascade
作者:Silvia M. Glueck、Walter M. F. Fabian、Kurt Faber、Sandra F. Mayer
DOI:10.1002/chem.200400061
日期:2004.7.19
Asymmetric enzyme-catalyzed hydrolysis of methylene-interrupted bis-epoxides 1 a and 1 b catalyzed by bacterial epoxide hydrolases furnished tetrahydrofuran derivatives 2 a and 2 b through a hydrolysis-rearrangement cascade. Whereas racemic bis-oxiranes 1 b-d underwent kinetic resolution with moderate stereoselectivities to yield products with up to 92 % ee and 66 % de: meso-bis-oxirane cis,cis-1 a
细菌环氧化物水解酶催化的亚甲基中断的双环氧化物1a和1b的不对称酶催化水解通过水解重排反应提供了四氢呋喃衍生物2a和2b。外消旋双环氧乙烷1 bd经过动力学拆分并具有中等立体选择性,生成的产品具有高达92%ee和66%de的产物:中双环氧乙烷顺式,cis-1a被转化为(6R,7R,9S,10S) Rhodococcus sp在94%ee和89%de处具有-2 a的高转化率(85%)。CBS 717.73是主要产品。反应顺序类似于仿生反应级联反应,可有效进入非乙酰化产乙酸素的结构核心,同时控制四个立体中心。