Reaction of 2-acetaminobenzamide with triethyloxonium fluoroborate gave 2-methyl-3, 4-dihydro-4-quinazolinone. On the other hand, in the reaction of 2-benzoylaminobenzamide in lieu of acetyl derivative with triethyloxonium fluoroborate were obtained 2-phenyl-4H-3, 1-benzoxazin-4-one and 2-phenyl-4-ethoxyquinazoline. And, the reaction of 2-benzoylaminothiobenzamide with triethyloxonium fluoroborate was obtained 4-ethylthio-2-phenylquinazoline.