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Gold-catalyzed tandem cyclization−oxidative alkynylation and cyclization-fluorination reactions of 2alkynone O-methyloximes are described. The reactions proceed smoothly at room temperature in the presence of 10 mol % of (PPh3)AuNTf2, 2.5 equivalents of selectfluor, and 2 equivalents of K3PO4. 2-Alkynone Omethyloximes undergo intramolecular oxyauration/cyclization and ensuing oxidative cross-coupling and fluorination process to afford the corresponding 3,4,5-trisubstituted isoxazoles in a cascade manner.

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Synthesis of 3,4,5-Trisubstituted Isoxazoles through Gold-Catalyzed Cascade Cyclization-Oxidative Alkynylation and Cyclization-Fluorination of 2-Alkynone O-Methyloximes