Abstract
AbstractThe adducts 4a, b, initially formed from the coumarins 1a, b and ene‐diamino ester 2, have been converted into substituted benzopyrano[3,4‐c]pyridines 5, 7, and 8. The tricyclic compound 7 is obtained by base‐catalyzed rearrangement of the decarboxylated adduct 3. The possible intermediate of this reaction is trapped as an acetate 6 upon treatment of 3 with acetic anhydride. The adduct 10 (from the acid 1a and ethyl 3‐aminocrotonate) decarboxylates spontaneously to give the dihydrocoumarin 11 which rearranges further to yield the 2‐pyridinone 12. The cyclohexenone 13 is isolated as byproduct.
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