Gold-catalyzed tandem cyclization-oxidative alkynylation and cyclization-fluorination reactions of 2-alkynone O-methyloximes are described. The reactions proceed smoothly at room temperature in the presence of 10 mol % of $(PPh_3)AuNTf_2$, 2.5 equivalents of selectfluor, and 2 equivalents of $K_3PO_4$. 2-Alkynone O-methyloximes 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.
报道了2-炔酮O-甲基
肟的
金银催化的串联环化-氧化炔基化和环化-
氟化反应。在室温下,反应在10 mol%的$(PPh_3)AuNTf_2$、2.5当量的selectfluor和2当量的$K_3PO_4$存在下顺利进行。2-炔酮O-甲基
肟经历了分子内的氧杂环化/环化以及随后的氧化交叉耦合和
氟化过程,以串联方式提供了相应的3,4,5-三取代的
异恶唑。