Studies on Heterocyclic Analogs of Azulene. VII. Regioselective Cycloadditions of Cycloheptimidazole to Electron-deficient Olefins

Abstract
Cycloheptimidazole reacted with electrondeficient olefins (e.g., ethyl acrylate or acrylonitrile) to give the regioselective [6+2] cycloadducts, which were readily dehydrogenated to give 2a,3-dihydro-1,2a-diazacyclopent[cd]azulenes