Thermoregulated Copper-Free Sonogashira Coupling in Water
作者:Ning Liu、Chun Liu、Qiang Xu、Zilin Jin
DOI:10.1002/ejoc.201100367
日期:2011.8
The Sonogashiracross-couplingreaction between aryl halides and terminal alkynes was carried out smoothly in water over a thermoregulated ligand–palladium catalyst under copper-free conditions, resulting in good to excellent yields. The Sonogashirareaction was sensitive to the electronic nature of the substituents on the aryl halides. Aryl halides with an electron-withdrawing group showed higher
The synthesis and applications of a micro-pine-structured nanocatalyst
作者:Vivek Polshettiwar、Mallikarjuna N. Nadagouda、Rajender S. Varma
DOI:10.1039/b814715a
日期:——
Dendritic nanoferrites with a micro-pine morphology have been synthesized for the first time under microwave irradiation conditions without using any reducing or capping reagent; the nanoferrites were then functionalized and coated with Pd metal, which catalyzes various organic transformations.
Fast copper-, ligand- and solvent-free Sonogashira coupling in a ball mill
作者:Rico Thorwirth、Achim Stolle、Bernd Ondruschka
DOI:10.1039/c000674b
日期:——
Pd-catalyst and DABCO. Results indicated that the employment of Pd(OAc)2 in combination with SiO2 as a grinding auxiliary preferentially induces the transformation of aryl iodides to the corresponding Sonogashiracoupling products. In contrast, both the substitution of SiO2 by Al2O3 or replacement of Pd(OAc)2 with Pd(PPh3)4 enable the reaction of aryl bromides with phenylacetylenes. The selective reaction of
Palladium-catalyzed phosphine-, copper-free and aerobic Sonogashira coupling in aqueous media
作者:Chun Liu、Fanying Bao、Qijian Ni
DOI:10.3998/ark.5550190.0012.b06
日期:——
protocol for the Sonogashiracoupling of aryl iodides with terminal alkynes has been developed using Pd2(dba)3 (dba=dibenzylideneacetone) as the catalyst under aqueous, copper-free and aerobic conditions. The coupling of aryl iodides with aromatic terminal alkynes provided good to excellent yields and moderate to good yields were achieved using aliphatic terminal alkynes as one of the coupling partners. Aqueous