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An efficient and convenient one-pot two-step process for the regioselective synthesis of the novel tricyclic system 2-chloro-4-methyl-5,6-dihydrobenzo[ b ]pyrimido[5,4- f ][1,4] oxazepine has been described  via  heterocyclization of 5-(chloromethyl)-2,4-dichloro-6-methylpyrimidine and 2-aminophenol under mild condition followed by reaction with the various secondary amine in moderate to good yields and short time ( 4a-f ).

An Efficient One-Pot and Regioselective Synthesis of Novel Heterocyclic Systems of 5,6-Dihydrobenzo[b]Pyrimido[5,4-f][1,4]Oxazepine