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A Simple Biosystem for the High‐Yielding Cascade Conversion of Racemic Alcohols to Enantiopure Amines
Author(s) -
Tian Kaiyuan,
Li Zhi
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202009733
Subject(s) - enantiopure drug , isopropylamine , enantioselective synthesis , chemistry , reductive amination , alcohol dehydrogenase , organic chemistry , alcohol , biocatalysis , cascade reaction , amine gas treating , ketone , amination , combinatorial chemistry , catalysis , reaction mechanism
The amination of racemic alcohols to produce enantiopure amines is an important green chemistry reaction for pharmaceutical manufacturing, requiring simple and efficient solutions. Herein, we report the development of a cascade biotransformation to aminate racemic alcohols. This cascade utilizes an ambidextrous alcohol dehydrogenase (ADH) to oxidize a racemic alcohol, an enantioselective transaminase (TA) to convert the ketone intermediate to chiral amine, and isopropylamine to recycle PMP and NAD + cofactors via the reversed cascade reactions. The concept was proven by using an ambidextrous CpSADH‐W286A engineered from ( S )‐enantioselective CpSADH as the first example of evolving ambidextrous ADHs, an enantioselective BmTA, and isopropylamine. A biosystem containing isopropylamine and E. coli (CpSADH‐W286A/BmTA) expressing the two enzymes was developed for the amination of racemic alcohols to produce eight useful and high‐value ( S )‐amines in 72–99 % yield and 98–99 % ee , providing with a simple and practical solution to this type of reaction.