Silyl Triflate-Catalyzed Oxonium-Ene Reaction of Lactol Allylic Ethers: A New and Stereocontrolled Route to Substituted Oxygen Heterocycles
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文摘
An ene-type reaction of lactol-derived allylic ethers is found to be catalyzed by silyl triflates to afford the propionaldehyde-substituted tetrahydrofuranes and -pyrans stereoselectively via the cyclic oxonium ion intermediate and allyloxysilyl moiety derived from the lactol allylic ethers.