Beilstein J. Org. Chem.2011,7, 606–614, doi:10.3762/bjoc.7.71
cyclization of internal diynes.
Proposed solvolysis/cyclization mechanism.
Gold-catalyzed cyclization of alkynyl epoxides and the 18O isotopic labeling experiment.
Proposed oxygen transfer mechanism.
Gold or silver-catalyzed cyclization of alkynyl epoxides and the corresponding deuteriumlabeling experiment.
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Graphical Abstract
Scheme 1:
Lewis acid or Brønsted acid-catalyzed alkyne–carbonyl metathesis and a proposed [2 + 2] intermediat...