A chemoenzymatic asymmetric synthesis of the hydroxy acid segment of schulzeines B and C
作者:Sucheta Biswas、Subrata Chattopadhyay、Anubha Sharma
DOI:10.1016/j.tetasy.2009.12.020
日期:2010.1
an enantioselective lipase-catalyzed acylation of a secondary alcohol, (ii) an efficient diastereoselective addition of an alkyl-lithium reagent to a glyceraldehyde derivative, (iii) conversion of an epoxide to a one-carbon homologated allylic alcohol via a sulphorane addition, and (iv) a cross metathesis between two chiral allylic alcohols and subsequent functionalization to obtain the ethyl ester of
通过构建模块方法开发了标题化合物的化学酶促不对称合成方法。合成的关键步骤是(i)对映选择性脂肪酶催化的仲醇酰化反应;(ii)烷基锂试剂向甘油醛衍生物的高效非对映选择性加成反应;(iii)环氧化物转化为单-碳通过磺胺加成使烯丙基醇均化,和(iv)两种手性烯丙基醇之间的交叉复分解和随后的官能化,以获得磺胺嘧啶的羟基酸单元的乙酯。