Compound (1) was treated with phenacyl bromide to yield compound (3), which was brominated to yield compound (4) and Further condensed with piperazine ester to obtained compound (6). Compound (6) was treated with hydrazine hydrate to obtained compound (7), which on further treatment with aromatic aldehydes which yielded corresponding Schiff base compound (8). Compound (8) in acidic medium undergoes cyclization to yield respective novels thiadiazine derivatives(9). The structures of the newly synthesized compounds were confirmed by IR, 1H NMR and mass spectroscopic analysis.
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