Stereospecific Palladium-Catalyzed Cross-Coupling of (<i>E</i>)- and (<i>Z</i>)-Alkenylsilanolates with Aryl Chlorides
作者:Scott E. Denmark、Jeffrey M. Kallemeyn
DOI:10.1021/ja065988x
日期:2006.12.1
geometrically defined (E)- and (Z)-alkenyl- and styrylsilanolates with a wide variety of aromatic and heteroaromatic chlorides has been achieved. Under catalysis by bulky, biphenyl-derived phosphines and allylpalladium chloride, the (preformed, stable) potassium salts of di-, tri- and tetrasubstituted alkenyldimethylsilanols undergo high yielding and highly stereospecific coupling to aryl chlorides in THF or dioxane
Enantioselective Nickel-Catalyzed Mizoroki–Heck Cyclizations To Generate Quaternary Stereocenters
作者:Jean-Nicolas Desrosiers、Jialin Wen、Sergei Tcyrulnikov、Soumik Biswas、Bo Qu、Liana Hie、Dmitry Kurouski、Ling Wu、Nelu Grinberg、Nizar Haddad、Carl A. Busacca、Nathan K. Yee、Jinhua J. Song、Neil K. Garg、Xumu Zhang、Marisa C. Kozlowski、Chris H. Senanayake
DOI:10.1021/acs.orglett.7b01054
日期:2017.7.7
The development of enantioselective carbon–carbon bond couplings catalyzed by nonprecious metals is highly desirable in terms of cost efficiency and sustainability. The first nickel-catalyzed enantioselective Mizoroki–Heck coupling is reported. This transformation is accomplished via mild reaction conditions, leveraging on QuinoxP* as a chiral ligand to afford oxindoles containing quaternary stereocenters