A general protocol for the reductive N-methylation of amines using dimethyl carbonate and molecular hydrogen: mechanistic insights and kinetic studies

Herein, we report for the first time a general and selective ruthenium-catalyzed reductive methylation of amines using dimethyl carbonate as a C 1 source and molecular hydrogen as a reducing agent. Notably, this methodology allows N -methylated tertiary aromatic and aliphatic amines to be obtained w...

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Bibliographic Details
Published in:Catalysis science & technology 2016-01, Vol.6 (22), p.7956-7966
Main Authors: Cabrero-Antonino, Jose R., Adam, Rosa, Junge, Kathrin, Beller, Matthias
Format: Article
Language:English
Subjects:
Amines
Aniline
Carbon
Carbonates
Catalysis
Dimethyl
Hydrogen
Reaction kinetics
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Summary:Herein, we report for the first time a general and selective ruthenium-catalyzed reductive methylation of amines using dimethyl carbonate as a C 1 source and molecular hydrogen as a reducing agent. Notably, this methodology allows N -methylated tertiary aromatic and aliphatic amines to be obtained with good to excellent yields using a green, non-toxic and biodegradable carbon source in the presence of an in situ formed Ru/Triphos complex. The catalytic protocol presented here opens the possibility of developing new sustainable processes for the selective synthesis of N -methyl substituted amines using molecular hydrogen. Mechanistic and kinetic studies have been carried out in order to understand the pathways involved in the general reaction mechanism for the N -methylation of aniline.
ISSN:2044-4753
2044-4761
DOI:10.1039/C6CY01401A