Cycloaddition of trifluoromethyl azafulvenium methides: synthesis of new trifluoromethylpyrrole-annulated derivatives
作者:Cláudio M. Nunes、Manuela Ramos Silva、Ana Matos Beja、Rui Fausto、Teresa M.V.D. Pinho e Melo
DOI:10.1016/j.tetlet.2009.11.033
日期:2010.1
azafulvenium methides acting as 1,3-dipoles is reported. These azafulvenium methides showed siteselectivity in the reaction with strong electron-deficient dipolarophiles leading exclusively to 1,3-cycloadducts. In the cycloaddition with less-activated dipolarophiles 1,7-cycloadducts resulting from [8π+2π] cycloaddition are also formed. FMO analysis of the cycloaddition reactions allowed the rationalization