Enantioselective, Catalytic One‐Pot Synthesis of
<i>γ</i>
‐Butyrolactone‐Based Fragrances
作者:Ceyda Kumru、Thomas Classen、Jörg Pietruszka
DOI:10.1002/cctc.201801040
日期:2018.11.7
Herein the preparative (1 g scale), stereoselective syntheses of various alkyl‐substituted γ‐butyrolactone fragrances 1 is described. The α,β‐unsaturated γ‐keto esters 2 as starting materials were synthesized by a Horner‐Wadsworth‐Emmons reaction and are further reduced by an ene reductase and alcohol dehydrogenase in a one‐pot enzyme cascade to nine desired γ‐butyrolactones 1, among them whisky (1 c)
本文描述了各种烷基取代的γ-丁内酯香料1的制备(1 g规模)的立体选择性合成。以Horner-Wadsworth-Emmons反应合成作为原料的α,β-不饱和γ-酮酸酯2,并通过单罐酶级联反应中的烯还原酶和醇脱氢酶进一步将其还原为九种所需的γ-丁内酯1,其中威士忌(1 c)和白兰地内酯(1 d)。产品1以中等至良好的收率和非常好的非对映选择性获得了C。此外,对n Bu取代基的位置进行了置换,以研究其对酶级联反应的影响。