β‐Ketoesters as Mono‐ or Bisnucleophiles: A Concise Enantioselective Total Synthesis of (−)‐Englerin A and B
作者:Lei Guo、Bernd Plietker
DOI:10.1002/anie.201900401
日期:2019.6.17
A short enantioselective total synthesis of englerin A, a guaiane sesquiterpene with significant in vitro antitumor activity, is reported. Key features of this total synthesis are an organocatalytic asymmetric decarboxylative aldol reaction, a neighboring‐group‐participating [4+3] cycloaddition, a novel one‐pot Heck coupling/regioselective 1,4‐hydrosilylation/Tamao–Fleming oxidation cascade, and a
据报道,一种短时的对映体全合成的englerin A是一种具有显着的体外抗肿瘤活性的愈创树倍半萜烯。该总合成的关键特征是有机催化不对称脱羧醛醇醛反应,邻基参与的[4 + 3]环加成反应,新颖的单锅Heck偶联/区域选择性1,4-氢化硅烷化/ Tamao-Fleming氧化级联反应以及降低CBS的动力学,从甲基乙二醛开始的十二个步骤中,生成的光学纯天然产物的总收率为6.7%。englerin A的更具反应性的乙醇酸酯部分的选择性皂化也产生(-)-englerinB。