title: Silicon-tethered strategy for copper(I)-catalyzed stereo- and regioselective alkylboration of alkynes.
abstract: Stereoselective silicon-tethered alkylboration of alkynes in the presence of a copper(I) catalyst and a diboron reagent provided the corresponding cyclic alkenylboronates in high yields (up to 99% yield) with excellent regio- and syn-selectivities (E/Z = <1:99). The products, which can be considered as the formal alkyne intermolecular alkylboration products, undergo subsequent selective derivatization, including ring opening, to give functionalized trans-stilbene derivatives.
authors.affiliation: Division of Chemical Process Engineering, Graduate School of Engineering, Hokkaido University , Sapporo, Hokkaido 060-8628, Japan.
authors.forename: Koji
authors.initials: K
authors.lastname: Kubota
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Iwamoto
authors.forename: Eiji
authors.initials: E
authors.lastname: Yamamoto
authors.forename: Hajime
authors.initials: H
authors.lastname: Ito