title: A new method for the synthesis of imidazolidinone- and benzimidazolone-containing
abstract: A novel acid-catalyzed double nucleophilic addition of bisthiols to heterocyclic bisacetals gives sulfur-containing macrocycles in good yield. Crossover experiments revealed that the acid-catalyzed N-acyl iminium cyclization for the imidazolidinones is reversible. The sulfur atom in the bridge was extruded photochemically, giving new [2.2]heterophanes containing the imidazolidinone and benzimidazolone ring systems. The determined crystal structures for representative members in the benzimidazolone series are also reported.
authors: Department of Chemistry, State University of New York, Buffalo, New York 14260-3000, USA.
authors: KK
authors: Ellis
authors: B
authors: Wilke
authors: Y
authors: Zhang
authors: ST
authors: Diver