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The gold(I)‐catalysed reaction of N‐Boc‐protected 6‐alkynyl‐3,4‐dihydro‐2H‐pyridines, which gives synthetically useful vinylogous amides (β‐enaminones), has been studied in detail, in order to optimize the reaction conditions, enlarge the scope and gain insight into the mechanism and the structural features that selectively favour the 6‐endo‐dig oxyauration of the triple bond. Experimental studies...
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