The cascade synthesis of quinazolinones and quinazolines using an alpha-MnO2 catalyst and tert-butyl hydroperoxide (TBHP) as an oxidant

Heterogeneously catalyzed synthesis of quinazolinones or quinazolines is reported in this study. An alpha-MnO2 catalyst is found to be highly active and selective in the oxidative cyclization of anthranilamides or aminobenzylamines with alcohols using TBHP as an oxidant. This protocol exhibits a broad substrate scope, and is operationally simple without an additive.