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A new FeCl3 and BF3⋅OEt2 co‐catalyzed tandem hetero‐[5+2] cycloaddition of 2‐(2‐aminoethyl)oxiranes with a wide range of alkynes, including terminal alkynes and alkyl‐substituted internal alkynes is presented. This is the first example of rapid and facile production of diverse 2,3‐dihydro‐1H‐azepines through a sequence of epoxide ring‐opening, annulation, and dehydroxylation with broad substrate scope...
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