Site-selective Hydrogenation/Deuteration of Benzylic Olefins Enabled by Electroreduction Using Water
1Albert-Ludwigs-Universität Freiburg, Institute of Organic Chemistry, Albertstr. 21, 79104, Freiburg im Breisgau, Germany.
Abstract:
We describe an operationally simple and user-friendly protocol that allows the site-selective hydrogenation and deuteration of di-, tri- and tetrasubstituted benzylic olefins by electroreduction while other groups prone to hydrogenation are present. The radical anionic intermediates react with the most inexpensive hydrogen/deuterium source H2 O/D2 O. Our method overcomes many limitations that arise from previously reported electroreductive hydrogenations. The applicability of this reaction is demonstrated by a broad substrate scope (>50 examples) that focuses on functional group tolerance and sites that are affected by metal-catalyzed hydrogenation (alkenes, alkynes, protecting groups).
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