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  • Title: Ruthenium-catalyzed intermolecular coupling reactions of arylamines with ethylene and 1,3-dienes: mechanistic insight on hydroamination vs ortho-C-H bond activation.
    Author: Yi CS, Yun SY.
    Journal: Org Lett; 2005 May 26; 7(11):2181-3. PubMed ID: 15901164.
    Abstract:
    [reaction: see text]. The cationic ruthenium complex [(PCy3)2(CO)(Cl)Ru=CHCH=C(CH3)2]+BF4- was found to be an effective catalyst for the coupling reaction of aniline and ethylene to form a approximately 1:1 ratio of N-ethylaniline and 2-methylquinoline products. The analogous reaction with 1,3-dienes resulted in the preferential formation of Markovnikov addition products. The normal isotope effect of k(NH)/k(ND) = 2.2 (aniline and aniline-d7 at 80 degrees C) and the Hammett rho = -0.43 (correlation of para-substituted p-X-C6H4NH2) suggest an N-H bond activation rate-limiting step for the catalytic reaction.
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