摘要
合成了四种含羟基官能团的四元杂环氮杂环卡宾前体咪唑盐,并用核磁共振、红外和单晶衍射等手段对化合物的结构进行了表征.这些咪唑盐前体与钯源PdCl_2(CH_3CN)_2组成的催化剂在碱(KOH)存在下可高效地催化SuzukiMiyaura偶联反应,该反应在叔丁醇/水(V∶V=1∶1)的混合溶剂中室温下即可进行,具有条件温和、收率高、绿色环保等优点.此外,PdCl_2(CH_3CN)_2/咪唑盐/CuI的混合催化剂体系即便在小装载量时对构建芳基炔类化合物的Sonogashira偶联反应也表现出良好的催化活性.其中,PdCl_2/咪唑盐3b催化剂对这两类偶联反应均表现出了高催化活性.
Four imidazolium precursors for the N-heterocyclic carbenes （NHCs） with a hydroxyl functionalized four-mem- bered heterocyclic side arm were synthesized and characterized by 1R, XRD and NMR spectroscopies. The corresponding NHC ligands thus generated in situ from these imidazolium precursors in the presence of base such as KOH, together with PdC12（CH3CN）2, exhibited excellent catalytic activity in Suzuki-Miyaura cross-coupling reactions for the synthesis of a range of biaryl compounds. The reactions could be conducted in the mixed solvent oftert-butyl alcohol/water （V ： V---- 1 ： l） at room temperature with the advantages of mild conditions, high efficiency as well as environmental friendliness. In addition, although in minor amount, the mixed catalyst system containing imidazolium salts, PdC12（CH3CN）2 （0.1%） and CuI （1%） exhibited excellent catalytic activity in Sonogashira coupling reaction. In particular, the combination system of PdCl/imidazolium salt 3b has been shown to be higher catalytically active for both coupling reactions.
出处
《有机化学》
SCIE
CAS
CSCD
北大核心
2017年第5期1258-1265,共8页
Chinese Journal of Organic Chemistry
基金
山西省基础研究计划项目(No.2015011029)
山西师范大学大学生创新实验项目(No.SD2014CXXM-36)
山西省研究生教育创新(No.2015BY38)资助项目~~
