Easy Access to Acetal-Spiroacetal-Enol Ethers by Tandem Dearomatization of a Furan Ring and Acetalization

[摘要]：A range of structurally novel acetal-spiroacetal-enol ethers were readily synthesized from 3-[5-(methoxymethyl)-2-furyl] propionaldehydes by dearomatization to form carbocations that were trapped intramolecularly by the formyl group with subsequent acetalization.

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