Pentafluoropyridine (PFPy)-mediated one-pot framework for the synthesis of pharmaceutically active 2,3-dihydroquinazolin-4(1H)-ones

This article describes the employment of commercially available, cheap pentafluoropyridine (PFPy) for a simple and straightforward one-pot synthesis of 2, 3-Dihydroquinazolin-4(1H)-ones. The reported protocol involves PFPy-mediated multicomponent condensation reaction of aldehyde, amine and isatoic anhydride at elevated temperature. This research work exploited the electron-withdrawing nature of fluorine atoms in PFPy for the nucleophilic substitution at para to the N-atom to produce fluoride ions that assisted the synthesis of the 2,3-Dihydroquinazolin-4(1H)-ones in excellent yield. The broad substrate scope, easy purification, short reaction times, high yields and ease of operation enhance the versatility of the protocol.