Acid‐Promoted Divergent and Chemoselective Annulation of 2‐(Methylthio)‐2‐Thioxoacetates for the Synthesis of 4‐Oxo‐3,4‐Dihydroquinazolines and 4‐Oxo‐4H‐Benzo[d][1,3]thiazines
A divergent and chemoselective method to quinazolinones and benzothiazinones has been developed through the reaction of alkyl/arylmethyl 2‐(methylthio)‐2‐thioxoacetate with 2‐aminobenzamides under Brønsted acid catalysis. The reaction delivered two structurally distinct heterocyclic scaffolds under different reaction...