Copper-Mediated Transformation of Organosilanes to Nitriles with DMF and Ammonium Iodide
摘要:
Cyanation of aryl-, diaryldimethyl-, and styrylsilanes was developed for the first time under copper-mediated oxidative conditions using ammonium iodide and DMF as the combined source of nitrogen and carbon atom of the introduced cyano unit, respectively. The reaction was observed to proceed in a two-step process: initial conversion of organosilanes to their iodo intermediates and then cyanation. This method has a broad substrate scope with high functional group tolerance.
commercial Pd/C catalyst. The good reactivity in the biomass-derived solvent (GVL) confirms that the Pd/PiNe heterogeneouscatalyst is a valid system that can be integrated into a waste valorization chain within a circular economy approach. In addition, the efficiency of the catalyst has also been extended to perform the challenging consecutive Hiyama–Heck reaction to afford differently substituted (E)-1
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
Palladium-catalyzed decarboxylative coupling reaction with alkynyl carboxylic acids and arylsiloxanes
作者:Jisun Jang、Gabriel Charles Edwin Raja、Ju-Hyeon Lee、Yujeong Son、Jimin Kim、Sunwoo Lee
DOI:10.1016/j.tetlet.2016.08.095
日期:2016.10
A decarboxylative coupling reaction for alkynyl carboxylic acids and arylsiloxanes was developed using a palladium catalyst. This method provided the desired coupled products in moderate to good yields by reacting the alkynyl carboxylic acids and arylsiloxanes with Pd(dba)2 (1.0 mol %), 1,1-bis(diphenylphosphino)methane (1.0 mol %), and AgF2 (2.0 equiv) at 60 °C for 6 h.
We report a chelation-assisted C–H arylation of various indoles with sterically and electronically diverse (hetero)arylsilanes enabled by cost-effective Cp*-free cobaltcatalysis. Key to the success of this strategy is the judicious choice of copper(II) fluoride as a bifunctional sliane activator and catalyst reoxidant. This methodology features a broad substrate scope and good functional group compatibility
Palladium-Catalyzed Conjugate Addition of Organosiloxanes to α,β-Unsaturated Carbonyl Compounds and Nitroalkenes
作者:Scott E. Denmark、Nobuyoshi Amishiro
DOI:10.1021/jo034763r
日期:2003.9.1
aryltrialkoxysilanes to alpha,beta-unsaturated carbonylcompounds (ketones, aldehydes) and nitroalkenes in the presence of SbCl(3), TBAF, AcOH, and a catalytic amount of Pd(OAc)(2), in CH(3)CN at 60 degrees C, provides the corresponding conjugate addition products in moderate to good yields. The addition of equimolar amounts of SbCl(3) and TBAF is necessary for this reaction to proceed smoothly. The arylpalladium