Nickel-Catalyzed <i>trans</i>-Alkynylboration of Alkynes via Activation of a Boron−Chlorine Bond
作者:Akihiko Yamamoto、Michinori Suginome
DOI:10.1021/ja055396z
日期:2005.11.1
Reaction of (diisopropylamino)chloroboryl ethers of alkynols with alkynylstannanes in the presence of nickel catalysts afforded formal trans-alkynylboration products in good yields. The products were isolated as pinacol boronates after treatment of the crude reaction mixture with acetic anhydride and pinacol in the presence of a base. The trans-alkynylboration products underwent Suzuki-Miyaura coupling reaction with organic halides. A 2-borylalkenylnickel(II) complex, in which the boryl and nickel groups are located in a trans fashion, was isolated in a reaction of the chloroboryl ether with a single equivalent of a nickel(0)-phosphine complex.