Ja. Marshall et D. Zou, A new synthesis of 3-carboxy-2,5-disubstituted furans and their conversionto 5-vinyl derivatives, TETRAHEDR L, 41(9), 2000, pp. 1347-1350
A new route to the title compounds is described. The key transformation inv
olves treatment of a 2-(4-keto-2-alkynyl)-3-ketobutanoate with silica gel o
r Et3N to effect ring closure and subsequent double bond isomerization. (C)
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