Stereoselective One-Pot Synthesis of Dihydropyrimido[2,1-<i>a</i>]isoindole-6(2<i>H</i>)-ones
作者:Philipp Kramer、Julia Schönfeld、Michael Bolte、Georg Manolikakes
DOI:10.1021/acs.orglett.7b03545
日期:2018.1.5
A diastereoselective one-pot synthesis of highly substituted dihydropyrimido[2,1-a]isoindole-6(2H)-ones containing three continuous stereocenters is reported. The reaction sequence is based on a hetero-Diels–Alder reaction between an enimide and a N-acylimine followed by an unprecedented Brønsted acid mediated rearrangement of an intermediate 5,6-dihydro-4H-1,3-oxazine to a pyrimido[2,1-a]isoindole
报告了非对映选择性一锅合成的高度取代的二氢嘧啶基[ 2,1- a ]异吲哚-6(2 H)-含有三个连续的立体中心。反应顺序是基于亚胺和N-嘧啶之间的杂Diels-Alder反应,然后是空前的布朗斯台德酸介导的中间体5,6-二氢-4 H -1,3-恶嗪重合成嘧啶基[ 2,1- α ]异吲哚。