Suzuki C−C couplings were performed in high yields in a fluorousbiphase system applying the four differently perfluoro-tagged Pd complexes 2a – d. All four complexes showed similar catalytic activities in the coupling of electron-rich or electron-deficient bromoarenes 3a – e and arylboronic acids 4a – c (Tables 1 and 2). Furthermore, we were able to show that all four Pd complexes could be recycled
Palladium salt and functional reduced graphene oxide complex: in situ preparation of a generally applicable catalyst for C–C coupling reactions
作者:Sheng Wang、Donghua Hu、Wenwen Hua、Jiangjiang Gu、Qiuhong Zhang、Xudong Jia、Kai Xi
DOI:10.1039/c5ra10585d
日期:——
A novel Pd catalyst was designed by affording Pd2+ salt on the surface of functional reduced graphene oxide (FRGO), providing a new cheap and stable in situ prepared palladiumcatalyst for C–C coupling reactions, including the Heck reaction, Suzuki reaction, C–H bond functionalization reactions of thiophenes, and terminal alkyne C–H activation and homocoupling.
to acting as a base during the catalytic process. In the catalyticsystem with a strong base, the soluble active PdII ion exhibited anti-reduction properties, which prevented aggregation and deactivation of Pd species. The entire catalyticsystem could be recycled after separating the product by simple filtration. The water-compatible and air-stable effective catalytic protocol described herein represents
Cross-Coupling of Triallyl(aryl)silanes with Aryl Bromides and Chlorides: An Alternative Convenient Biaryl Synthesis
作者:Akhila K. Sahoo、Takuro Oda、Yoshiaki Nakao、Tamejiro Hiyama
DOI:10.1002/adsc.200404188
日期:2004.12
give various biaryls in good yields. It is worthwhile to note that the all-carbon-substituted arylsilanes, stable towards moisture, acid, and base and easily accessible, serve as a highly practical alternative to their aryl(halo)silane counterparts. A catalyst system consisting of [(η3-C3H5)PdCl]2 and 2-[2,4,6-(i-Pr)3C6H2]-C6H4PCy2 and use of TBAF⋅3 H2O in THF-H2O are effective especially for the cross-coupling
在DMSO-H 2 O中存在PdCl 2 / PCy 3和氟化四丁基铵(TBAF)的情况下,多种芳基溴化物与三烯丙基(芳基)硅烷的交叉偶联是有效的,以高收率得到各种联芳基。值得一提的是,全碳取代的芳基硅烷对水分,酸和碱稳定,易于获得,可作为其芳基(卤代)硅烷对应物的高度实用替代品。由[(η的催化剂体系3 -C 3 H ^ 5)的PdCl] 2和2- [2,4,6-(我-Pr)3 c ^ 6 ħ 2 ] -C 6 H ^ 4 PCY2和在THF-H 2 O中使用TBAF·3 H 2 O对于与芳基氯的交叉偶联特别有效。两种催化剂体系均能耐受多种常见的官能团。推测反应的高效率归因于用TBAF·3 H 2 O和适量的水处理后烯丙基的易裂解。二烯丙基(二苯基)硅烷还可以与各种芳基溴化物和氯化物交联,收率很高,而烯丙基(三苯基)硅烷只能以中等收率得到交联产物。通过溴氯苯与不同芳基硅烷的顺序交叉偶联,可
A Highly Active Cobalt Catalyst System for Kumada Biaryl Cross-Coupling
作者:Wenqin Wu、Hung Duong
DOI:10.1055/s-0037-1609337
日期:2018.6
A highlyactivecobaltcatalyst system has been developed for the cross-coupling reactions of arylmagnesium reagents and aryl bromides. In the presence of 1 mol% CoCl2, 2 mol% IPr·HCl and 2 mol% NaO t Bu, a wide range of (hetero)biaryls are prepared in 51–99% yields at room temperature within a short reaction time.
高活性钴催化剂体系已被开发用于芳基镁试剂和芳基溴化物的交叉偶联反应。在 1 mol% CoCl2、2 mol% IPr·HCl 和 2 mol% NaO t Bu 的存在下,在室温下短时间内反应时间可以以 51-99% 的产率制备多种(杂)联芳基化合物。