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Vinyl Triflimides-A Case of Assisted Vinyl Cation Formation
Sebastian Schroeder1, Christina Strauch1, Niklas Gaelings1
1Institute of Organic Chemistry, RWTH Aachen, Landoltweg 1, 52072, Aachen, Germany.
Abstract:
A new concept for selectivity control in carbocation-driven reactions has been identified which allows for the chemo-, regio-, and stereoselective addition of nucleophiles to alkynes-assisted vinyl cation formation-enabled by a Li+ -based supramolecular framework. Mechanistic analysis of a model complex (Li2 NTf2 + ⋅3 H2 O) confirms that solely the formation of a complex between the incoming nucleophile and the transition state of the alkyne protonation is responsible for the resulting selective N addition to the vinyl cation. Into the bargain, a general, operationally simple synthetic procedure to previously inaccessible vinyl triflimides is provided.
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