title: Rhodium-catalyzed asymmetric synthesis of silicon-stereogenic dibenzosiloles by enantioselective [2+2+2] cycloaddition.
abstract: A rhodium-catalyzed asymmetric synthesis of silicon-stereogenic dibenzosiloles has been developed through a [2+2+2] cycloaddition of silicon-containing prochiral triynes with internal alkynes. High yields and enantioselectivities have been achieved by employing an axially chiral monophosphine ligand, and the present catalysis is also applicable to the asymmetric synthesis of a germanium-stereogenic dibenzogermole. Preliminary studies on the optical properties of these compounds are also described.
authors.affiliation: Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656 (Japan). shintani@chembio.t.u-tokyo.ac.jp.
authors.forename: Ryo
authors.initials: R
authors.lastname: Shintani
authors.forename: Chihiro
authors.initials: C
authors.lastname: Takagi
authors.forename: Tomoaki
authors.initials: T
authors.lastname: Ito
authors.forename: Masanobu
authors.initials: M
authors.lastname: Naito
authors.forename: Kyoko
authors.initials: K
authors.lastname: Nozaki
keywords: asymmetric catalysis; cycloaddition; dibenzosilole; rhodium; silicon