Ligand-Controlled Remarkable Regio- and Stereodivergence in Intermolecular Hydrosilylation of Internal Alkynes: Experimental and Theoretical Studies
作者:Shengtao Ding、Li-Juan Song、Lung Wa Chung、Xinhao Zhang、Jianwei Sun、Yun-Dong Wu
DOI:10.1021/ja405752w
日期:2013.9.18
The first highly efficient ligand-controlled regio- and stereodivergent intermolecular hydrosilylations of internal alkynes have been disclosed. Cationic ruthenium complexes [Cp*Ru(MeCN)3](+) and [CpRu(MeCN)3](+) have been demonstrated to catalyze intermolecular hydrosilylations of silyl alkynes to form a range of vinyldisilanes with excellent but opposite regio- and stereoselectivity, with the former
designed a series of hydroxy(aryl)‐λ3‐iodane–[18]crown‐6 complexes, prepared from the corresponding iodosylbenzene derivatives and superacids in the presence of [18]crown‐6, and have investigated their reactivities in aqueous media. These activated iodosylbenzene monomers are all non‐hygroscopic shelf‐storable reagents, but they maintain high oxidizing ability in water. The complexes are effective for
Regioselective Cycloaddition of 3-Azetidinones and 3-Oxetanones with Alkynes through Nickel-Catalysed Carbon-Carbon Bond Activation
作者:Kelvin Y. T. Ho、Christophe Aïssa
DOI:10.1002/chem.201200167
日期:2012.3.19
Get in the ring! The first examples of transition‐metal‐catalysed CC bond activation of 3‐azetidinones and 3‐oxetanones are reported. In the presence of a nickel catalyst and alkynes, a regioselective and high‐yielding [4+2] cycloaddition occurs, leading to the formation of pyridinones, pyranones and eventually 4,5‐disubstituted 3‐hydroxypyridines (see scheme).
Silylium-Catalyzed Carbon-Carbon Coupling of Alkynylsilanes with (2-Bromo-1-methoxyethyl)arenes: Alternative Approaches
作者:Belén Rubial、Alfredo Ballesteros、José M. González
DOI:10.1002/ejoc.201800777
日期:2018.12.6
The catalytic coupling of the title compounds affords β‐halo‐substituted alkynes. The cationic nature of the C–C bond‐forming event is established and the actual competence of silylium species to catalyze this transformation is proved.
Ni-Catalyzed Sonogashira Coupling of Nonactivated Alkyl Halides: Orthogonal Functionalization of Alkyl Iodides, Bromides, and Chlorides
作者:Oleg Vechorkin、Delphine Barmaz、Valérie Proust、Xile Hu
DOI:10.1021/ja906040t
日期:2009.9.2
Ni-catalyzed Sonogashira coupling of nonactivated, beta-H-containing alkyl halides, including chlorides, is reported. The coupling is tolerant to a wide range of functional groups, including ether, ester, amide, nitrile, keto, heterocycle, acetal, and aryl halide, in both coupling partners. The coupling can be selective for a specific C-X bond (X = I, Br, Cl) and allows for orthogonal functionalization