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An efficient method to prepare 6‐(2‐azidophenyl)‐4H‐1,3‐dioxins and 4,5‐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...
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