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Facile synthesis of differently substituted 5-benzylidene-2-aryl-5,6-dihydro-4H-[1,3]oxazin-6ones 2a-2h has been achieved by heating a mixture of substituted N-benzoyl-β-aminopropanoic acids 1a-1d with several aromatic aldehydes in the presence of sodium acetate and acetic anhydride. These compounds 2a-2h, on refluxing with o-phenylenediamine in dry benzene resulted in the formation of differently substituted 4-benzylidene-1-aryl-3,4dihydropyrimidobenzimidazoles 3a-3h. The synthesized compounds 2a-2h and 3a-3h were characterized by elemental analysis and spectral studies (IR, H NMR and CNMR).

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Synthesis of some biologically active 5-benzylidene-2-aryl-5,6-dihydro-4H-[1,3]oxazin-6-ones and 4-benzylidene-1-aryl-3,4-dihydropyrimidobenzimidazoles with bridged nitrogen