Microwave-assisted generation and reactivity of aza- and diazafulvenium methides: heterocycles via pericyclic reactions
作者:Maria I.L. Soares、Teresa M.V.D. Pinho e Melo
DOI:10.1016/j.tetlet.2008.06.013
日期:2008.8
2-dioxo-1H,3H-pyrazolo[1,5-c]thiazoles, respectively. Pericyclic reactions of these 1,7-dipole intermediates, namely, sigmatropic [1,8]H shifts, 1,7-electrocyclization or [8π+2π] cycloaddition led to the synthesis of a range of pyrrole and pyrazole derivatives. The first evidence for the azafulvenium methides by intermolecular trapping via [8π+2π] cycloaddition is reported.
在微波辐射下,由2,2-二氧代-1 H,3 H-吡咯并[1,2- c ]噻唑和2,2-二氧代-1 H,3 H-吡唑并[1, 5- c ]噻唑。这些1,7-偶极中间体的周环反应,即σ[1,8] H移位,1,7-电环化或[8π+2π]环加成反应导致合成了一系列吡咯和吡唑衍生物。报道了通过[8π+2π]环加成进行分子间捕集的甲基氮杂富烯鎓甲基化物的第一个证据。