Dp. Acharya et S. Chattopadhyay, AN IMPROVED SYNTHESIS OF 2,3-DISUBSTITUTED 4-(3H)-QUINAZOLINONES FROM2-ACYLAMINO (N-ARYL) BENZAMIDES, Indian Journal of Heterocyclic Chemistry, 7(2), 1997, pp. 101-104
2-Acylamino (N-aryl) benzamides (3a,h) on refluxing with TsOH in benze
ne or acetonitrile solution undergo smooth cyclodehydration to 2,3-dis
ubstituted 4-(3H)-quinazolinones (4a-h). A convenient procedure for co
nverting isatoic anhydride (1) to 2-amino (N-aryl/alky) benzamides (2)
is also reported.