[4+2] Cycloadditions of 3-Tetrazolyl-1,2-diaza-1,3-butadienes: Synthesis of 3-Tetrazolyl-1,4,5,6-tetrahydropyridazines
作者:Susana M. M. Lopes、Amadeu F. Brigas、Francisco Palacios、Américo Lemos、Teresa M. V. D. Pinho e Melo
DOI:10.1002/ejoc.201101826
日期:2012.4
3-tetrazolyl-1,4,5,6-tetrahydropyridazines by Diels–Alder reactions of ethyl 3-(tetrazol-5-yl)-1,2-diaza-1,3-butadiene-1-carboxylates is reported. These 1,2-diaza-1,3-dienes reacted with electron-richheterocycles, nucleophilic olefins and cumulenes, as well as with electron-deficient dienophiles, to give the target compounds regioselectively. Computational studies corroborated the rationalization of the observed