Highly functionalized and fused furans have been synthesized via cascade reactions of Morita-BaylisHillman and Rauhut-Currier adducts of nitroalkenes with active methylene compounds. The reactions involving S N 2 0 -intramolecular Michael addition or Michael addition-intra-molecular nucleophilic substitution take place in a regioselective manner to afford synthetically and biologically useful furans in moderate to good yields.
Base mediated deacylation of title compounds (II) generates diazoester anion, a reactive 1,3‐dipol, which undergoes [3 + 2] annulation with chalcones (I) to afford pyrazole ketoesters (III).
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