Studies in the formation of heterocyclic rings containing nitrogen: Part XXIII. Condensation ofo-aminobenzamide with aldehydes and schiff bases

N-Arylidene orthanilamides undergo isomeric cyclisation in acetic acid to the corresponding 2-aryl-1, 2, 3, 4-tetrahydro-4-oxoquinazolines. The u.v. and n.m.r. spectra of some of the arylidene derivatives and their isomeric tetrahydroquinazolines have neeb studied. Condensation ofo-aminobenzamide either with aromatic aldehydes in nitrobenzene or Schiff bases in acetic acid has yielded 2-aryl-4 (3H)-quinazolinones.     

Reaction of hexachloropropene with dihydroxy aryl aldehydes,ketones and acids

The reaction of hexachloropropene with dihydroxy aryl aldehydes, ketones and acids has been explored to synthesise substituted 3, 4-dichlorocoumarins. The structures of the latter have been deduced from their spectral-analytical data.