Catalytic Asymmetric [3 + 2] Cycloaddition of Exocyclic Enol Ethers for the Synthesis of Spiroketals
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An efficient synthesis of chiral benzannulated spiroketals via catalytic asymmetric [3 + 2] cycloaddition of exocyclic enol ethers with p-quinones was achieved. The transformation was enabled by a chiral N,N'-dioxides/TmIII complex as the Lewis acid catalyst ... ...
