Regio- and stereo-selective aza-Diels–Alder reaction of ethyl glyoxylate 4-methoxyphenylimine with 1,3-dienes in the presence of BF3·Et2O. Evidence for a non-concerted mechanism
作者:M. José Alves、Nuno G. Azoia、A. Gil Fortes
DOI:10.1016/j.tet.2006.10.085
日期:2007.1
Cycloadditions of the glyoxylate imine 1 with 1-substituted and 1,4-di substituted 1,3-dienes furnished tetrahydroquinoline compounds 4 and 5/15 with total regio- and stereo-control, except for one case where a mixture of isomers was formed. A stepwise mechanism is proposed in view of the stereochemistry of the products. (c) 2006 Elsevier Ltd. All rights reserved.