Catalytic Enantioselective β-Alkylation of α,β-Unsaturated Aldehydes by Combination of Transition-Metal- and Aminocatalysis: Total Synthesis of Bisabolane Sesquiterpenes
作者:Samson Afewerki、Palle Breistein、Kristian Pirttilä、Luca Deiana、Pawel Dziedzic、Ismail Ibrahem、Armando Córdova
DOI:10.1002/chem.201100756
日期:2011.8.1
aldehydes by combination of simple chiral amine and copper catalysts provides β‐branched aldehydes in a one‐pot protocol (see scheme). The methodology was applied to the short total syntheses of bisabolane sesquiterpenes (S)‐(+)‐curcumene, (E)‐(S)‐(+)‐3‐dehydrocurcumene and (S)‐(+)‐tumerone.
分支出!通过简单的手性胺和铜催化剂的组合,α,β-不饱和醛的第一个共催化对映选择性(可达98:2 er)的β-烷基化可在单反应釜协议中提供β-支化醛(参见方案)。该方法适用于短波半萜倍半萜烯(S)-(+)-姜黄素,(E)-(S)-(+)-3-脱氢姜黄素和(S)-(+)-肿瘤酮的短总合成。