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  • Title: Gold-catalyzed cascade cyclization-oxidative alkynylation of allenoates.
    Author: Hopkinson MN, Ross JE, Giuffredi GT, Gee AD, Gouverneur V.
    Journal: Org Lett; 2010 Nov 05; 12(21):4904-7. PubMed ID: 20936849.
    Abstract:
    A gold(I)-catalyzed cascade cyclization-oxidative cross-coupling process has been applied to prepare β-alkynyl-γ-butenolides directly from allenoates and various terminal alkynes. Following an initial gold-catalyzed C-O bond forming allenoate cyclization, a mechanism based on a Au(I)/Au(III) redox cycle has been proposed with Selectfluor acting as the external oxidant.
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