Ruthenium-Catalyzed Intramolecular Oxidative Amination of Aminoalkenes Enables Rapid Synthesis of Cyclic Imines

Teruyuki Kondo, Takumi Okada, and Take-aki Mitsudo*
Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
J. Am. Chem. Soc., 2002, 124 (2), pp 186–187
DOI: 10.1021/ja017012k
Publication Date (Web): December 15, 2001
Copyright © 2002 American Chemical Society

Abstract

Abstract Image

[RuCl2(CO)3]2/dppp is shown to be a highly effective catalyst system for the first intramolecular oxidative amination of a variety of aminoalkenes when it is used concomitantly with K2CO3 and allyl acetate in N-methylpiperidine, to give the corresponding cyclic imines and indoles in excellent yields. For example, the reaction of 2,2-diphenyl-4-pentenyl-1-amine performed in the presence of 2 mol % of [RuCl2(CO)3]2, 4 mol % of dppp, K2CO3, and allyl acetate in N-methylpiperidine at 140 °C for 8 h gives 4,4-diphenyl-2-methyl-1-pyrroline in quantitative (>99%) yield.

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History

  • Published In Issue January 16, 2002
  • Received September 6, 2001
    Revised November 12, 2001

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