Gold-catalyzed intramolecular carbocyclization of alkynyl ketones leading to highly substituted cyclic enones

Org Lett. 2007 Dec 6;9(25):5259-62. doi: 10.1021/ol702455v. Epub 2007 Nov 8.

Abstract

The reaction of the internal alkynyl ketones 1 (n=1) under the combined catalyst, AuCl3 and AgSbF6, gave the enones 2 in good to high yields, whereas that of the terminal alkynyl ketones 1 (n=0) under the combined catalyst, AuCl3 and AgOTf, afforded the cyclic enones 3.