An efficient protocol for copper-free palladium-catalyzed Sonogashira cross-coupling in aqueous media at low temperatures
作者:Alexander N. Marziale、Johannes Schlüter、Jörg Eppinger
DOI:10.1016/j.tetlet.2011.09.031
日期:2011.11
A thorough study on copper-freeSonogashira cross-couplings in water was carried out using the palladacycle, [Pd(μ-Cl)κ2-P,C-P(iPr)2(OC6H3-2-Ph)}}2] as pre-catalyst with different bases and palladium concentrations. The highly active pre-catalyst imparts good to near quantitative yields using a concentration of 0.25 mol % at 40 °C. This broadly applicable protocol exhibits high tolerance of functional