Captodative olefins: methyl 2-aryloxy-3-dimethyl-aminopropenoates and their application in a new synthesis of benzofurans
作者:Marı́a del Carmen Cruz、Joaquı́n Tamariz
DOI:10.1016/j.tetlet.2004.01.073
日期:2004.3
The beta-substituted captodative olefins methyl 2-aryloxy-3-dimethylaminopropenoates 4a-h were synthesized, via amino-methylenation of the corresponding 2-phenoxyacetic esters 9a-h. Lewis acid promoted intramolecular cyclization of alkenes 4 led to benzofurans 7a-h, in an efficient synthetic approach to the benzofuran frame. (C) 2004 Elsevier Ltd. All rights reserved.