Reactions of various α-alkyl-substituted furans with ethyl diazoacetate or methyl diazopropionate in the presence of Rh2(OAc)4, followed by iodine-induced isomerization, yielded a variety of functionalized 1,3-diacyl-butadienes (furan ring-unravelled products). Though with furfural and 2-acetylfuran the reaction took place at the sidechain, with furfural acetal both the furan as well as acetal moities participated.
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