Catalysis

Intermolecular amination of allenes via twofold photocatalytic nitrene transfer reactions

Authors

Abstract

The amination with monovalent, nitrogen-based intermediates constitutes an important reaction for the construction of valuable amines. The high basicity of reagents, reaction intermediates or products however poses significant challenges to metal-catalyzed amination through coordination and blocking of catalytically active sites and hampering their efficiency. In this context, high-yielding intermolecular amination reaction of allenes remain an unsolved challenge in organic synthesis and general methods are not available. Herein, we describe a photochemical approach towards the intermolecular amination of allenes via free nitrene radical anions as the key reactive intermediate. This reaction proceeds without the participation of catalyst-bound nitrogen species and can thus overcome current limitations. We report on the application in the amination of allenes to give azetidine and cyclopropyl amines with a broad and general substrate scope. Experimental and theoretical studies were performed to provide an understanding of the reaction mechanism and rationalize the high efficiency of this photocatalytic approach.

Content

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Supplementary material

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Experimental Supplemental Information
Supplemental Information with experimental and mechanistic data
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Computational Supplemental Information
Energies, 3D structures and Cartesian Coordinates