The intramolecular aza-Wittig reaction has attracted consider- able attention recently because of its high potential for synthesis of nitrogen heterocycles. 1-3 The ready and clean generation of iminophosphoranes from azides, and their aza-Wittig type reaction with carbonyl groups provides a regiospecific synthesis of imines. Several interesting appli- cations of the intramolecular version of the above sequence have appeared recently.3 However, the reactivity criteria for these ...