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Single isomers of the furanylidene system  8  were synthesized in four steps. The synthesis begins with the dianion of β-keto carbonyls and culminates in a mild, tandem desilylation-cyclization reaction using tosylic acid. Compounds synthesized in this study have the potential for further diversification at the alkyne, carbonyl and enol-ether moieties. Hence, the furanylidenes from this study are prospective building blocks for biologically active, furan-containing natural products and their analogs.

Furanylidene systems from a tosylic acid-mediated, tandem desilylation-cyclization reaction of silyl ethers of monoalkynylated β-keto carbonyls