This review describes our recent efforts in the development of chiral dinuclear vanadium complexes that work as dual activation catalysts for the oxidative coupling of 2-naphthols. The dinuclear vanadium(iv) complex (R(a),S,S)- was prepared by complexation of VOSO(4) with the Schiff base derived from (R)-3,3'-diformyl-2,2'-dihydroxy-1,1'-binaphthyl () and (S)-tert-leucine. Since the dinuclear vanadium(iv) complex was found to be readily oxidized to afford a corresponding vanadium(v) species during preparation in air, a new synthetic procedure using VOCl(3) has been applied towards dinuclear vanadium(v) complexes (R(a),S,S)- and (R(a),S,S)-. To the best of our knowledge, (R(a),S,S)-, and show considerably higher catalytic activity than previously reported vanadium complexes for the oxidative coupling of 2-naphthols.

Preparation and structural analysis of chiral dinuclear vanadium(v) catalysts with high catalytic activity for the oxidative coupling of 2-naphthols are described.

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A convenient one-pot procedure for the preparation of dinuclear vanadium(V) complex is described. The complex exhibited high catalytic activity for oxidative coupling of 2-naphthol derivatives. In addition, coupling of 9-phenanthrol gave (S)-10,10¢dihydroxy-9,9¢-biphenanthryl in quantitative yield with 93% ee.

Naphthols Q 0850 Chiral Dinuclear Vanadium(V) Catalysts for Oxidative Coupling of 2-Naphthols. -Preparation and structural analysis of chiral dinuclear vanadium-catalysts with high catalytic activity for the enantioselective oxidative coupling of 2-naphthols (I) is described. -(TAKIZAWA, S.; KATAYAMA, T.; KAMEYAMA, C.; ONITSUKA, K.; SUZUKI, T.; YANAGIDA, T.; KAWAI, T.; SASAI*, H.; Chem. Commun.