C−C Bond Formation Catalyzed Heterogeneously by Nickel-on-Graphite (Ni/C<sub>g</sub>)
作者:Bruce H. Lipshutz、Tom Butler、Elizabeth Swift
DOI:10.1021/ol702453q
日期:2008.3.1
Inexpensive nickel(II) mounted on graphite (Ni/Cg) can be easily activated and used to heterogeneously catalyze cross-couplings involving aryl halides/tosylates with boronic acids, vinylalanes, and vinylzirconocenes. Comparisons are made with the charcoal analogue, Ni/C, and some unusual chemoselectivities between these catalysts have been uncovered.
Suzuki−Miyaura Reactions of Arenediazonium Salts Catalyzed by Pd(0)/C. One-Pot Chemoselective Double Cross-Coupling Reactions
作者:Rachel H. Taylor、François-Xavier Felpin
DOI:10.1021/ol0712733
日期:2007.7.1
Suzuki-Miyaura cross-coupling of arenediazoniumtetrafluoroboratesalts with boronicacid partners catalyzed by Pd(0)/C is described as a practical and efficient alternative to classical homogeneous conditions. Reactions conducted in alcoholic solvents proved to be extremely fast using mild conditions. Additionally, we developed a chemoselective double Suzuki-Miyaura cross-coupling in a single reaction
An efficient strategy for the nickel-catalysed synthesis of biaryls and terphenyls has been developed in environmentally-friendly reaction media. In the presence of β-diketone and PPh3 ligands, Ni(TFA)2 acted as an effective catalyst for the Suzuki–Miyaura cross-coupling of aryl halides and arylboronic acids in an ionic liquid solution. Biaryls and terphenyls were obtained in good yields under this
An efficient protocol to synthesize unsymmetrical triphenylenes from electron-rich biphenyls and diaryliodoniumsalts via Cu catalysis was developed. A variety of unsymmetrical triphenylenes with diversified functional groups were synthesized according to this method. This transformation went through multiple direct C–H arylations from easily produced starting materials with high step-economy. The