Azavinyl azomethine ylides from thermal ring opening of α-aziridinohydrazones: Unprecedented 1,5-electrocyclization to imidazoles
Michael-type addition of aziridinecarboxylates to 1,2-diaza-1,3-butadienes under solvent-free conditions (SFC) resulted in the formation of α-aziridinohydrazone adducts. In toluene under reflux, α-aziridinohydrazones gave imidazoles in moderate to good yi