simple and efficient method for the synthesis of 3‐oxopropanenitriles from variously substituted heterocyclic compounds via direct electrophilic cyanoacetylation is described. A series of heterocyclic 3‐oxopropanenitriles (2a, 2b, 2c, 2d, 2e, 2f, 2g, 2h, 2i, 2j, 2k) have been synthesized using mixed anhydride (acetic or trifluoroaceticanhydride:cyanoacetic acid) in the presence of Mg(ClO4)2·2H2O as
Synthesis of π-conjugated thiophenes starting from substituted 3-oxopropanenitriles via Gewald reaction
作者:Zita Puterová、Anita Andicsová、Daniel Végh
DOI:10.1016/j.tet.2008.09.032
日期:2008.12
This paper describes the synthesis of beta-aryl and beta-heteroaryl substituted 2-aminothiophenes as a novel class of building blocks in oligo- and polythiophenes. The synthesis was carried out in two steps, involving synthesis of substituted 3-oxopropanenitrile intermediates, followed by the Gewald reaction. (C) 2008 Elsevier Ltd. All rights reserved.