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Novel 1 H -pyrimido [4,5- c ][1,2]diazepines  3 & 4  and pyrazolo [3,4- d ]pyrimidines  6  were regioselectively synthesised by the reaction of 1,3-dimethyl-6-hydrazinouracils  1  with various α,β-unsaturated compounds  2  and α-ketoalkynes  8  in excellent yields.

One-pot synthesis of novel 1H-pyrimido[4,5-c][1,2]diazepines and pyrazolo[3,4-d]pyrimidines