Sulfonated N-Heterocyclic Carbenes for Pd-Catalyzed Sonogashira and Suzuki-Miyaura Coupling in Aqueous Solvents
作者:Sutapa Roy、Herbert Plenio
DOI:10.1002/adsc.200900886
日期:——
of the respective disulfonated N‐heterocyclic carbene (NHC) precursors in reasonable yields (46–77%). Water‐soluble palladium catalyst complexes, in situ obtained from the respective sulfonated imidazolinium salt, sodium tetrachloropalladate (Na2PdCl4) and potassium hydroxide (KOH) in water, were successfully applied in the copper‐free Sonogashira coupling reaction in isopropyl alcohol/water mixtures
所述的反应N,N' -diarylimidazolium和N,N'与在相应的二磺化的形成氯磺酸结果-diarylimidazolinium盐ñ -杂环卡宾(NHC)在合理的产率(46-77%)的前体。水溶性钯催化剂络合物,在原位从相应磺化咪唑啉盐获得,四氯钯钠(Na 2的PdCl 4)和水中的氢氧化钾(KOH)已成功用于异丙醇/水混合物中的无铜Sonogashira偶联反应中,催化剂用量为0.2 mol%。预先形成的(二磺化NHC)PdCl(肉桂基)络合物以0.1 mol%的催化剂负载量用于Suzuki-Miyaura水溶液中。此处报道的偶联方案对于N和S杂环芳基溴化物和氯化物与芳基和烷基乙炔的Sonogashira反应非常有用。