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  • Title: Synthesis of optically active dihydropyrans from asymmetric [4 + 2] cycloaddition of β,γ-unsaturated α-ketoesters with allenic esters.
    Author: Pei CK, Jiang Y, Shi M.
    Journal: Org Biomol Chem; 2012 Jun 14; 10(22):4355-61. PubMed ID: 22555871.
    Abstract:
    β-Isocupreidine (β-ICD) catalyzed asymmetric [4 + 2] cycloaddition of β,γ-unsaturated α-ketoesters with allenic esters afforded ester-substituted functionalized dihydropyran derivatives in high yields along with high enantioselectivities under mild conditions.
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