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  • Title: Rh-catalyzed enantioselective [2 + 2] cycloaddition of alkynyl esters and norbornene derivatives.
    Author: Shibata T, Takami K, Kawachi A.
    Journal: Org Lett; 2006 Mar 30; 8(7):1343-5. PubMed ID: 16562887.
    Abstract:
    [reaction: see text] The enantioselective [2 + 2] cycloaddition of alkynes possessing an ester functionality and norbornene derivatives proceeded efficiently using a chiral rhodium catalyst. The chiral tri- and tetracyclic cyclobutenes were obtained in moderate to high ee.
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