Oxidative synthesis of quinazolinones and benzothiadiazine 1,1-dioxides from 2-amino-benzamide and 2-aminobenzenesulfonamide with benzyl alcohols and aldehydes

An interesting procedure for the zinc-catalyzed oxidative transformation of ready available 2-aminobenzamide, 2-aminobenzenesulfonamide with benzyl alcohols has been developed. Various quinazolinones and benzothiadiazine 1,1-dioxides were prepared in moderate to good yields under identical conditions. The reactions of both aromatic aldehydes and aliphatic aldehydes with 2-aminobenzamide under catalyst free conditions were described as well. In water media, the products were formed in good yields.