Sorribes I, Cabrero-Antonino JR, Vicent C, Junge K, Beller M. Catalytic N-Alkylation of Amines Using Carboxylic Acids and Molecular Hydrogen.
J Am Chem Soc 2015;
137:13580-7. [PMID:
26484397 DOI:
10.1021/jacs.5b07994]
[Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
A convenient, practical and green N-alkylation of amines has been accomplished by applying readily available carboxylic acids in the presence of molecular hydrogen. Applying an in situ formed ruthenium/triphos complex and an organic acid as cocatalyst, a broad range of alkylated secondary and tertiary amines are obtained in good to excellent yields. This novel method is also successfully applied for the synthesis of unsymmetrically substituted N-methyl/alkyl anilines through a direct three-component coupling reaction of the corresponding amines, carboxylic acids, and CO2 as a C1 source.
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