The combination of (p-CF3C6H4)3PAuCl and AgOTf generates a powerful catalyst for the intramolecular cyclizations of readily available γ-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.
(p -CF 3 C 6 H 4)3 PAuCl和AgOTf的组合为在温和条件下易于获得的γ-羟基炔酮的分子内环化生成了强大的催化剂。取代的3(2 H)-呋喃酮的产率为55-94%。该方法也适用于制备2,3-二氢-4 H-吡喃-4-酮。