An Efficient Iminophosphorane-Mediated Synthesis of Thieno[3,2-<i>c</i>]pyridine, Thieno[2,3-<i>c</i>]pyridine and Furo[3,2-<i>c</i>]-pyridine Derivatives

Abstract

A number of thieno[3,2-c]pyridines 4, thieno[2,3-c]pyridines 7 and furo[3,2-c]pyridines 11 derivatives have been prepared by reaction of the appropriate iminophosphorane, available from ethyl azidoheteroarylacrylates and triphenylphosphine, with aromatic isocyanates.