Synthesis 2019; 51(07): 1585-1594
DOI: 10.1055/s-0037-1610681
paper
© Georg Thieme Verlag Stuttgart · New York

One-Pot Synthesis of N-Arylated Amines by Hydroaminomethyl­ation of 2,5-Dihydrofuran with Aromatic Amines

Zhiwen Zheng
a   State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, Gansu, P. R. of China   Email: wll@licp.cas.cn
b   University of Chinese Academy of Sciences, Beijing 100039, P. R. of China   Email: zhengzhiwen@licp.cas.cn
,
Lailai Wang*
a   State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, Gansu, P. R. of China   Email: wll@licp.cas.cn
› Author Affiliations
This work was supported by the National Natural Science Foundation of China (21633013, 21073211, 21174155) and Key Research Program of Science and Technology Project of Gansu province (18YF1GA124).
Further Information

Publication History

Received: 26 September 2018

Accepted after revision: 21 November 2018

Publication Date:
16 January 2019 (online)


Abstract

A new efficient catalytic system for one-step synthesis of N-arylated amines, for example, an important intermediate, 4-ethyl-N-[(tetrahydrofuran-3-yl)methyl]aniline, is achieved by using different rhodium precursor and phosphorus ligands catalyzed hydroaminomethylation of aniline and its derivatives with heterocyclic and/or cyclic olefins. By screening the reaction parameters, the optimal reaction conditions are found as follows: methanol as a solvent, PPh3 as a ligand, [Rh(cod)2]BF4 as a catalyst precursor, a P/Rh ratio of 5:1, syngas pressure 4 MPa (H2/CO = 3:1), 100 °C, 20 hours, and no additives. The conversion of aniline reaches >99% and the yield of N-[(tetrahydrofuran-3-yl)methyl]aniline is up to 99% using this catalytic system. Moreover, the reaction of aniline and various cyclic olefins is investigated under the optimal conditions, and excellent conversion and good yields are obtained.

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