Preparation, Reactivity and Synthetic Applications of Bis(iminophosphoranes): New Entries to Fused 1,3,5-Benzotriazepines, 1,3-Benzodiazepines and Indole Derivatives

Article abstract of DOI:10.1016/S0040-4020(01)92251-3

An aza-Wittig-type reaction of bis(iminophosphorane) 2 with two moles of alkyl or aryl iso(thio)cyanates leads to indazolo<2',3':1,5><1,2,4>triazolo<4,3-a><1,3,5>benzotriazepines 7.The bis(iminiphosphorane) 4 reacts with aromatic iso(thio)cyanates to give