first example of transition-metal-catalyzed C–H activations of 2-phenylisatogens with alkynes and sulfonyl azides has been developed using N-oxide as the directing group. Ru(II)-Catalyzed C–H alkenylation/cyclization and Ir(III)-catalyzed direct C–H sulfamidation proceeded with good yields and excellent functional group tolerance. Importantly, these two transformations provided straightforward routes
Sonogashira Reaction of Aryl Halides with Terminal Alkynes Catalyzed by Cobalt Hollow Nanospheres
作者:Peipei Sun、Jianchun Bao、Lizhe Feng、Fangxian Liu
DOI:10.1055/s-2008-1072615
日期:2008.5
Sonogashira reaction catalyzed by cobalt hollow nanospheres has been developed. Coupling of alkynes with aryl iodide or aryl bromide in the presence of potassium carbonate, triphenylphosphine, and cuprous iodide provides the corresponding products with moderate to good yields, which reveals obvious advantages such as low-cost catalyst, the recyclability of the catalyst, and simple experimental operation.
Nickel-Catalyzed Arylative Carboxylation of Alkynes with Arylmagnesium Reagents and Carbon Dioxide Leading to Trisubstituted Acrylic Acids
作者:Sheng Wang、Chanjuan Xi
DOI:10.1021/acs.orglett.8b01693
日期:2018.7.6
Nickel-catalyzed arylcarboxylation of alkynes with arylmagnesium reagents and carbondioxide (CO2, 1 atm) was realized in one pot. Various trisubstitutedacrylicacids within an aryl group at the β-position have been prepared efficiently with good regioselectivity under mild conditions. The resulting products could be further transformed to benzoannelated cycles retaining CO2 as a one-carbon synthon