Synthesis of 2-(1,2,4-oxadiazol-3-yl)quinazolin-4(3H)-ones from diaminoglyoxime-based nitrones

Various 2-[5-(aryl)-1,2,4-oxadiazol-3-yl]quinazolin-4(3H)-ones have been synthesized from the reaction of diaminoglyoxime-based nitrones with methyl 2-aminobenzoate or 2-aminobenzamide in the presence of acetic acid at 100 °C. The reaction was extended as a one-pot three-component approach starting from diaminoglyoxime, aldehyde and methyl 2-aminobenzoate.

Synthesis of Tetracyclic 8-Aza-Naphthalen-9-Ones and Oxa-Naphthalen-9-One

Bromination of 1-methylbenzo[f]chromen-3-one with N-bromosuccinimide gives 2-bromo-1-methylbenzo[f]chromen-3-one which, on condensation with different primary aromatic amines, gives tetracyclic aza-naphthalen-9-ones. Condensation of 2-bromo-1-methylbenzo[f]chromen-3-one with different secondary cyclic amines also gives tetracyclic oxa-naphthalen-9-one. The formation of 8-aza-naphthalen-9-one and 7,8-dioxa-naphthalen-9-one is confirmed by their single crystal analyses.