Three-component reaction between imidazoles, isocyanates, and cyanophenylacetylene: a short-cut to N-(Z)-alkenylimidazole-2-carboxamides
作者:Kseniya V. Belyaeva、Ludmila V. Andriyankova、Lina P. Nikitina、Anastasiya G. Mal’kina、Andrei V. Afonin、Boris A. Trofimov
DOI:10.1016/j.tetlet.2012.10.049
日期:2012.12
1-Substituted imidazoles, isocyanates, and cyanophenylacetylene react under mild (rt), non-catalytic solvent-free conditions to give (Z)-(2-cyano-1-phenylethenyl)imidazole-2-carboxamides in up to 72% yields and with ca. 100% stereoselectivity. The reaction starts from the initialformation of zwitterion/carbene intermediates captured by the isocyanate as the electrophile followed by migration of the