5-dihydro[1,3]dioxino[5,4-b]indoles by gold-catalyzed tandem-annulation of 3-(2-azidophenyl)prop-2-yn-1-ols with aldehydes was examined. The reactions afforded the products in moderate to excellent yields under mild reaction conditions. Uniquely, the reactions proceeded with complete control of product chemoselectivity for a variety of 3-(2-azidophenyl)prop-2-yn-1-ols in the presence of 2-dicyclohexylphosphino-2′