Synthesis of symmetrical and unsymmetrical triarylpyrylium ions by inverse electron demand Diels-Alder reaction
C. T. Fathimath Salfeena, Basavaraja, K. T. Ashitha, V. Praveen Kumar, Sunil Varughese, Cherumuttathu H. Suresh and B. S. Sasidhar*
BF3•OEt2 mediated inverse electron demand Diels–Alder (IEDDA) reaction of chalcones with aryl acetylenes has been 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 the diverse array of pyrylium ions in moderately good yield.
Chemical Communications, 2018, DOI: 10.1039/C8CC06444J.