SYNTHESES AND REGIOSELECTIVE CYCLOADDITION REACTIONS OF CYCLOHEPT[<i>d</i>]IMIDAZO[1,2-<i>a</i>]IMIDAZOLES (1,3<i>a</i>,9-TRIAZACYCLOPENT[<i>a</i>]AZULENES): FORMATION OF 2,3-DIAZACYCLOHEPTA[<i>ef</i>]CYCL[3.2.2]AZINE SYSTEM
Cyclohept[d]imidazo[1,2-a]imidazoles (1,3a,9-triazacyclopent[a]azulenes), being synthesized from 2-aminocycloheptimidazole, was allowed to react with reactive acetylenes to give 2,3-diazacyclohepta[ef]cycl[3.2.2]azines regioselectively.