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2‐Azetidinone‐tethered alkynols, readily prepared from the corresponding aldehydes or ketones, were used as starting materials for the oxycyclization reaction catalyzed by precious metals. AgOAc exclusively affords dihydrofurans, methylenetetrahydrofurans, or methylenetetrahydro‐2H‐pyrans through specific 5‐endo, 5‐exo, or 6‐exo pathways, respectively. Interestingly, in the presence of a catalytic...
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