Asymmetric Synthesis of 3-Substituted Cyclohexylamine Derivatives from Prochiral Diketones<i>via</i>Three Biocatalytic Steps
作者:Elina Siirola、Francesco G. Mutti、Barbara Grischek、Sebastian F. Hoefler、Walter M. F. Fabian、Gideon Grogan、Wolfgang Kroutil
DOI:10.1002/adsc.201201057
日期:2013.6.17
Prochiral bicyclic diketones were transformed to a single diastereomer of 3‐substituted cyclohexylamine derivatives via three consecutive biocatalytic steps. The two chiral centres were set up by a CC hydrolase (6‐oxocamphor hydrolase) in the first step and by an ω‐transaminase in the last step. The esterification of the intermediate keto acid was catalysed by a lipase in the second step if possible
前手性双环二酮通过三个连续的生物催化步骤转化为3个取代的环己胺衍生物的单一非对映异构体。的两个手性中心通过一个C设置在第一步骤C中水解酶(6-oxocamphor水解酶),并通过在最后步骤中的ω转氨酶。如果可能的话,在第二步中,通过脂肪酶催化中间体酮酸的酯化反应。对于两个基板,CC水解步骤和酯化反应可以在有机溶剂中的一锅级联反应中同时进行。在一个示例中,可以将前两步的反应混合物直接在有机溶剂中进行生物胺化反应,而无需更换反应介质。根据所用ω-转氨酶和底物的选择,可以以光学纯的形式获得顺式和反式非对映异构体。