Development of a Formal Catalytic Asymmetric [4+2] Addition of Ethyl-2,3-butadienoate with Acyclic Enones

[摘要]：Allene esters are unique not only as excellent electrophiles but also because of their ability for subsequent reactivity after the initial nucleophilic attack. A mechanistically inspired cyclization using ethyl-2,3-butadienoate and acyclic enones to provide dihydropyrans In excellent yields and enantioselectivity under solvent-free conditions at room temperature is reported.

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