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Pyrido(3,4-d)pyridazine was shown to undergo thermally induced Diels-Alder reactions (inverse electron-demand) with enamines as electron-rich dienophiles, yielding isoquinoline derivatives. The regiochemistry of the cycloaddition was investigated.

Unsubstituted pyrido[3,4-d]pyridazine as an electron-deficient azadiene in [4+2] cycloaddition reactions: a short route to g-fused isoquinolines