Allenes. Part 38. Imidazolines, benzimidazoles, and hexahydrobenzimidazoles from 1,2-diamines and allenic or acetylenic nitriles
Abstract
The double Michael addition of 1,2-diamine to allenic or acetylenic nitriles has been shown to give imidazolines, benzimidazoles, or hexahydrobenzimidazoles in excellent yields via conjugated enaminic nitriles.