Showing papers by "Hiroaki Sasai published in 2008"
TL;DR: Dinuclear vanadium(v) complexes (R(a),S,S)- and show considerably higher catalytic activity than previously reported vanadium complexes for the oxidative coupling of 2-naphthols.
91 citations
TL;DR: In this article, an efficient enantioselective oxidative coupling of 2-naphthol derivatives based on a concept of dual activation catalysis was realized, and a chiral dinuclear vanadium(IV) complex (Ra,S,S)-1e possessing (S)-tert-leucine moieties at the 3,3′-positions of the (R)-binaphthyl skeleton was developed, which was found to promote the oxidative coupling.
65 citations
TL;DR: Preparation and structural analysis of chiral dinuclear vanadium(v) catalysts with high catalytic activity for the oxidative coupling of 2-naphthols are described.
56 citations
TL;DR: An efficient synthetic method for chiral (isoxazole-isoxoxoline) ligands based on a spiro[4.5]decane framework has been developed.
Abstract: An efficient synthetic method for chiral (isoxazole–isoxazoline) ligands based on a spiro[4.5]decane framework has been developed. A variety of enantiomerically pure ligands were readily prepared via the Suzuki–Miyaura coupling. The palladium complexes of these ligands have proven to be effective catalysts for the asymmetric Wacker-type cyclization of an alkenyl alcohol.
24 citations
TL;DR: In this article, the preparation and structural analysis of chiral dinuclear vanadium(v) catalysts with high catalytic activity for the oxidative coupling of 2-naphthols is described.
Abstract: Preparation and structural analysis of chiral dinuclear vanadium(v) catalysts with high catalytic activity for the oxidative coupling of 2-naphthols are described.
3 citations
2 citations
1 citations
1 citations
TL;DR: In this paper, a library of 13 chiral spiro imidazolium (SIL) salts has been synthesized and the effects of N-substituents and counteranions on the melting point of SIL have been studied in efforts toward the development of room temperature chiral ionic liquids.
Abstract: A library of 13 novel chiral spiro imidazolium salts has been synthesized. The effects of N-substituents and counteranions on the melting point of spiro bis(imidazolium) salts are studied in efforts toward the development of room temperature chiral ionic liquids.
1 citations