Asymmetric Benzylic Allylic Alkylation Reaction of 3-Furfural Derivatives by Dearomatizative Dienamine Activation
作者:Xiao-Long He、Hui-Ru Zhao、Chuan-Qi Duan、Xu Han、Wei Du、Ying-Chun Chen
DOI:10.1002/chem.201800585
日期:2018.4.20
The dearomatizative dienamine‐type ortho‐quinodimethane species are smoothly generated between 2‐alkyl‐3‐furfurals and chiral secondary amine catalysts, which undergo asymmetric benzylic allylic alkylation reactions with 2‐nitroallylic acetates efficiently. A spectrum of densely functionalized 3‐furfural derivatives are delivered in moderate to high yields with good to excellent diastereo‐ and enantioselectivity
脱芳香化的二烯胺型邻喹啉甲烷物质在2-烷基-3-糠醛和手性仲胺催化剂之间平稳生成,它们与2-硝基烯丙基乙酸盐有效地进行了不对称的苄基烯丙基烷基化反应。一系列功能强大的3-糠醛衍生物以中等至高收率提供,具有良好或优异的非对映选择性和对映选择性(最高收率98%,> 19:1 dr,> 99% ee)。潜在的转化使得可以轻松生产一些对映体富集的体系结构,例如1,1,2,2-四芳基乙烷和三芳基甲烷,这是其他协议中不容易获得的。