Aqueous Sonogashira coupling of aryl halides with 1-alkynes under mild conditions: use of surfactants in cross-coupling reactions
作者:Gina M. Roberts、Wenya Lu、L. Keith Woo
DOI:10.1039/c5ra00505a
日期:——
Aqueous Sonogashira coupling between lipophilic terminal alkynes and aryl bromides or iodides gave moderate to high yields at 40 °C using readily available and inexpensive surfactants (2.0 w/v% in water) such as SDS and CTAB. The catalyst precursor was 2 mol% Pd(PPh3)2Cl2, and included a 5 mol% Cu(I) co-catalyst for aryl iodide substrates. Aryl-bromide reagents were found to be inhibited by iodide
亲脂性末端炔烃与芳基溴化物或碘化物之间的Sonogashira水溶液偶联在40°C下使用容易获得且便宜的表面活性剂(在水中为2.0 w / v%),例如SDS和CTAB,可得到中等至高收率。催化剂前体是2mol%的Pd(PPh 3)2 Cl 2,并且包括用于芳基碘化物底物的5mol%的Cu(I)助催化剂。发现芳基溴化物试剂被碘化物和Cu(I)抑制。在无Cu(I)条件下的研究揭示了两种竞争途径。去质子化途径产生了传统的Sonogashira产物(3),而碳pal化途径产生了烯炔[ 5]。。表面活性剂溶液(SDS或CTAB)最多可循环使用三次,以在CuI存在下在1-辛炔和1-碘庚烷之间偶联,然后降低产率。
Iron/copper-catalyzed C–C cross-coupling of aryl iodides with terminal alkynes
作者:Chandra M. Rao Volla、Pierre Vogel
DOI:10.1016/j.tetlet.2008.07.151
日期:2008.10
Synergic effect of iron and copper salts as catalysts for the Sonogashira–Hagihara cross-couplings of aryl iodides with terminal alkynes is demonstrated. High yields of cross-coupled products are obtained under conditions that are smoother than those using only CuI as catalyst. Furthermore no expensive or/and toxic ligand is required.
Sonogashira Coupling Using Bulky Palladium-Phenanthryl Imidazolium Carbene Catalysis
作者:Yudao Ma、Chun Song、Wei Jiang、Quansheng Wu、Yong Wang、Xueying Liu、Merritt B. Andrus
DOI:10.1021/ol035147k
日期:2003.9.1
[GRAPHICS]Bulky phenanthracenyl imidazolium-derived carbene ligands were investigated for copper-free Sonogashira coupling with terminal acetylenes. Aryl bromides and iodides gave coupled products in excellent yields from the Pd(PPh3)(2)Cl-2 complex with potassium t-butoxide and 18-crown-6 in THF. A remarkable dependence on the size of the ligand was found. The highest yields were obtained with the bulky 2,9-dicyclohexyl-10-phenanthryl ligand 5.
A General and Versatile Method for CC Cross-Coupling Synthesis of Conjugated Enynes: One-Pot Sequence Starting from Carbonyl Compounds
作者:Ilya M. Lyapkalo、Michael A. K. Vogel
DOI:10.1002/anie.200504594
日期:2006.6.12
Iron Powder-CuI Cooperative Catalytic System in Sonogashira Cross-Coupling Reaction