title: Tetranuclear titanium 7,7'-modified binaphtholate cluster as a novel chiral Lewis acid catalyst.
abstract: Chiral tetranuclear Ti cluster, a cubic structure constituted of four Ti atoms and OHs, and six (R)-binaphthols (BINOL) bridged two Ti atoms as ligands, is shown to be a novel chiral Lewis acid catalyst for the [2+3] cycloaddition reaction with nitrones. The chiral Ti clusters with 7,7'-substituted (R)-BINOL ligands was synthesized to give enhanced enantiomeric excesses up to 78% ee.
authors.affiliation: Department of Chemical Technology, Tokyo Institute of Technology, Tokyo, Japan. kmikami@o.cc.titech.ac.jp
authors.forename: K
authors.initials: K
authors.lastname: Mikami
authors.forename: M
authors.initials: M
authors.lastname: Ueki
authors.forename: Y
authors.initials: Y
authors.lastname: Matsumoto
authors.forename: M
authors.initials: M
authors.lastname: Terada