Rhodium(III)-Catalyzed Direct C–H Arylation of Various Acyclic Enamides with Arylsilanes
作者:Xiaolan Li、Kai Sun、Wenjuan Shen、Yong Zhang、Ming-Zhu Lu、Xuzhong Luo、Haiqing Luo
DOI:10.1021/acs.orglett.0c03578
日期:2021.1.1
The stereoselective β-C(sp2)–H arylation of various acyclic enamides with arylsilanes via Rh(III)-catalyzed cross-coupling reaction was illustrated. The methodology was characterized by extraordinary efficacy and stereoselectivity, a wide scope of substrates, good functional group tolerance, and the adoption of environmentally friendly arylsilanes. The utility of this present method was evidenced by
Synthesis of the CD-ring of the anticancer agent streptonigrin: studies of aryl–aryl coupling methodologies
作者:William T. McElroy、Philip DeShong
DOI:10.1016/j.tet.2006.04.074
日期:2006.7
the success of the coupling process. Analogs of the CD biaryl were prepared by coupling of aryl siloxane derivatives (D-ring component) with highly functionalized 4-bromopyridines (C-ring); however, the CD biaryl of the natural product could not be prepared in high yield by siloxane coupling due to the facile formation of reduced pyridine under the coupling conditions. Alternatively, the fully functionalized
Improved Synthesis of Aryltriethoxysilanes via Palladium(0)-Catalyzed Silylation of Aryl Iodides and Bromides with Triethoxysilane
作者:Amy S. Manoso、Philip DeShong
DOI:10.1021/jo010621q
日期:2001.11.1
silylation of aryl halides with triethoxysilane has been expanded to include aryl bromides. A more general Pd(0) catalyst/ligand system has been developed that activates bromides and iodides: palladium(0) dibenzylideneacetone (Pd(dba)(2)) is activated with 2-(di-tert-butylphosphino)biphenyl (Buchwald's ligand) (1:2 mol ratio of Pd/phosphine). Electron-rich para- and meta-substituted aryl halides (including
Preparation and Palladium-Catalyzed Cross-Coupling of Aryl Triethylammonium Bis(catechol) Silicates with Aryl Triflates
作者:W. Michael Seganish、Philip DeShong
DOI:10.1021/jo035309q
日期:2004.2.1
Pentavalent aryl and heteroaryl bis(catechol) silicates undergo palladium-catalyzedcross-coupling with aryl and heteroaryl triflates in the presence of a fluoride source in excellent yields. These solid, air-stable bis(catechol) silicates are prepared from a high-yielding displacement reaction between catechol and an aryl siloxane in the presence of an amine base. The cross-couplingreaction is tolerant
The Hiyama Cross‐Coupling Reaction at Parts Per Million Levels of Pd: In Situ Formation of Highly Active Spirosilicates in Glycol Solvents
作者:Shun Ichii、Go Hamasaka、Yasuhiro Uozumi
DOI:10.1002/asia.201901155
日期:2019.11.4
A palladium NNC-pincer complex at a 5 mol ppm loading efficiently catalyzed the Hiyama coupling reaction of aryl bromides with aryl(trialkoxy)silanes in propylene glycol to give the corresponding biaryls in excellent yields. This method was applied to the syntheses of adapalene and a biaryl-type liquid-crystalline compound, as well as to the derivatization of dextromethorphan and norfloxacin. ESI-MS