Synthesis of Symmetrical and Unsymmetrical Triarylpyrylium Ions Via An Inverse Electron Demand Diels–Alder Reaction

Abstract

BF3 OEt2 mediated inverse electron demand Diels–Alder (IEDDA) reaction of chalcones with aryl acetylenes is reported for the synthesis of symmetrical and unsymmetrical 2,4,6-triarylpyrylium ions. The protocol provides an effective one-pot method for the utilization of readily available simple substrates under mild reaction conditions leading to a diverse array of pyrylium ions in moderately good yield.