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  • Title: Enantioselective [4 + 2]-Annulation of Oxadienes and Allenones Catalyzed by an Amino Acid Derived Phosphine: Synthesis of Functionalized Dihydropyrans.
    Author: Ni H, Yao W, Waheed A, Ullah N, Lu Y.
    Journal: Org Lett; 2016 May 06; 18(9):2138-41. PubMed ID: 27091405.
    Abstract:
    An enantioselective [4 + 2]-annulation process between cyano-activated oxadienes and allenones is developed. An l-valine-derived phosphine was efficient in catalyzing the reaction, and a wide range of highly functionalized dihydropyrans were prepared in high yields and with excellent enantioselectivities.
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