Diastereoselective Synthesis of Tetrahydroquinolines via [4 + 2] Annulation between in Situ Generated <i>p</i>-Quinone Methides and Nitroalkenes
作者:Junwei Wang、Xiang Pan、Jian Liu、Lin Zhao、Ying Zhi、Kun Zhao、Lihong Hu
DOI:10.1021/acs.orglett.8b02127
日期:2018.10.5
A formal [4 + 2] annulation reaction between in situ generated p-quinone methides and nitroalkenes via an aza-Michael/1,6-conjugate addition reaction sequence has been developed in which manganese dioxide is used as the oxidant to promote in situ formation of o-tosylaminophenyl-substituted p-QMs. Under mild conditions, this unprecedented cascade reaction readily occurs in good yield, providing straightforward
已经开发出通过aza-Michael / 1,6-共轭加成反应序列在原位生成的对苯二甲酰甲烷和硝基烯烃之间进行正式的[4 + 2]环化反应,其中使用二氧化锰作为氧化剂来促进原位形成的ø -tosylaminophenyl取代p -QMs。在温和的条件下,这种空前的级联反应容易以高收率发生,从而可以直接获得一系列的4-芳基取代的四氢喹啉。