Biocatalytic Cascade for the Synthesis of Enantiopure β-Azidoalcohols and β-Hydroxynitriles
作者:Joerg H. Schrittwieser、Iván Lavandera、Birgit Seisser、Barbara Mautner、Wolfgang Kroutil
DOI:10.1002/ejoc.200900091
日期:2009.5
one-pot reaction sequence starting from prochiral α-chloroketones leading to enantiopure β-azidoalcohols and β-hydroxynitriles is described. Asymmetric bioreduction of α-chloroketones by hydrogen transfer catalysed by an alcohol dehydrogenase (ADH) established the stereogenic centre in the first step to furnish enantiopure chlorohydrin intermediates. Subsequent biocatalysed ring closure to the epoxide
描述了从前手性 α-氯酮开始导致对映纯 β-叠氮醇和 β-羟基腈的三步、两酶、一锅反应序列。通过由醇脱氢酶 (ADH) 催化的氢转移对 α-氯酮进行不对称生物还原,在第一步中建立了立体中心,以提供对映纯的氯醇中间体。随后通过非选择性卤代醇脱卤酶 (Hhe) 催化环氧化物的生物催化闭环和用叠氮化物 N3- 或氰化物 CN- 的亲核开环进行完全保留构型,得到对映体纯的 β-叠氮醇和 β-羟基腈,分别。合成了各种光学纯 β-叠氮醇和 β-羟基腈的两种对映异构体。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)