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  • Title: Catalytic [4+2] cyclization of α,β-unsaturated acyl chlorides with 3-alkylenyloxindoles: highly diastereo- and enantioselective synthesis of spirocarbocyclic oxindoles.
    Author: Shen LT, Jia WQ, Ye S.
    Journal: Angew Chem Int Ed Engl; 2013 Jan 07; 52(2):585-8. PubMed ID: 23150385.
    Abstract:
    Cinchona alkaloids were used as Lewis base catalysts in the title reaction. The [4+2] cyclization of α,β-unsaturated acyl chlorides with electron-deficient alkenes derived from oxindole gave the corresponding spirocarbocyclic oxindoles.
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