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  • Title: Enantioselective Synthesis of Dihydropyran-Fused Indoles through [4+2] Cycloaddition between Allenoates and 3-Olefinic Oxindoles.
    Author: Wang F, Li Z, Wang J, Li X, Cheng JP.
    Journal: J Org Chem; 2015 May 15; 80(10):5279-86. PubMed ID: 25893317.
    Abstract:
    A highly enantioselective [4+2] annulation with respect to allenoates and 3-olefinic oxindoles catalyzed by Lewis base was reported, which proved to be an efficient way to synthesize chiral dihydropyran-fused indoles. The cycloaddition products were generally obtained in high yields (up to 98%) with very good enantioselectivities (up to 94% enantiomeric excess).
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