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Amidrazone 1a and the tricarbonyl derivatives 2b–d reacted in boiling ethanol in the presence of 2,5-norbornadiene 5 giving the pyridine derivatives 6b–d respectively (59–72%) and in the presence of 2,3-dihydrofuran 7 yielding the lactones 10b–d (39–44%). The 2,2′-bipyridine derivatives 6e–g were similarly obtained in good yield (81–87%) from the reaction of amidrazone 1b and tricarbonyl derivatives...
Amidrazone 1 reacted with the unsymmetrical tricarbonyls 2a, 2c and 2d giving triazines 3a, 3c and 3d, respectively. These triazines were converted into their corresponding pyridine derivatives 6a, 6c and 6d in aza Diels–Alder reactions with 2,5-norbornadiene 5. Triazines 3c and 3d gave the pyridolactones 9c and 9d with 2,3-dihydrofuran.
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