bearing 2,9-diaryl-1,10-phenanthroline ligands exhibit not only unprecedented catalytic activity but also unusual ligand-controlled divergent regioselectivity in hydrosilylation reactions of various alkynes. The hydrosilylation protocol described herein provides a highly efficient method for preparing useful di- and trisubstituted olefins on a relatively large scale under mild conditions, and its use
NHC Ligands Tailored for Simultaneous Regio- and Enantiocontrol in Nickel-Catalyzed Reductive Couplings
作者:Hengbin Wang、Gang Lu、Grant J. Sormunen、Hasnain A. Malik、Peng Liu、John Montgomery
DOI:10.1021/jacs.7b04583
日期:2017.7.12
sterically demanding environment. Using this newly accessible ligand class, nickel-catalyzed enantioselective reductive coupling reactions of aldehydes and alkynes have been developed. These studies illustrate that the newly available NHC ligands are well suited for simultaneous control of regio- and enantioselectivity, even in cases with internal alkynes possessing only very subtle steric differences between
Transition-Metal-Mediated Cascade Reactions: <i>C</i>,<i>C</i>-Dicyclopropylmethylamines by Way of Double C,C-σ-Bond Insertion into Bicyclobutanes
作者:Peter Wipf、Corey R. J. Stephenson、Kazuo Okumura
DOI:10.1021/ja038623a
日期:2003.12.1
The organometallic multicomponent reaction of alkenyl zirconocene, alkynyl imine, and zinc carbenoid in the presence of dimethylzinc leads to novel C,C-dicyclopropylmethylamines. The formation of intermediate bicyclo[1.1.0]butanes represents the first synthetically useful example of a double C,C-sigma-bond insertion, and the increase in structural complexity from starting materials is highlighted by the formation of nine new C,C-bonds in the final product.
Alkylidenecarbenes from acyclic vinyl bromides and potassium tert-butoxide
作者:Joseph Wolinsky、Gregory W. Clark、Patricia C. Thorstenson
DOI:10.1021/jo00867a001
日期:1976.3
Cobalt-Hydride-Catalyzed Hydrosilylation of 3-Alkynes Accompanying π-Bond Migration
作者:Yeong Bum Kim、Dongwook Kim、Shashikant U. Dighe、Sukbok Chang、Jung-Woo Park