The combination of (p-CF(3)C(6)H(4))(3)PAuCl and AgOTf generates a powerful catalyst for the intramolecular cyclizations of readily available gamma-hydroxyalkynones under mild conditions. The substituted 3(2H)-furanones are obtained in 55-94% yields. This method is also applicable to the preparation of 2,3-dihydro-4H-pyran-4-ones.
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| http://dx.doi.org/10.1021/jo100048j | DOI Listing |
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