Double C-H Functionalization to Construct Polycyclic Heteroarenes Catalyzed by an Ionic Salt of a Pd Complex with an N-Heterocyclic Carbene Ligand
作者:Sanjay Kumar Ghosh、Bing-Chiuan Kuo、Hsiang-Yu Chen、Jia-Ying Li、Shuang-De Liu、Hon Man Lee
DOI:10.1002/ejoc.201500417
日期:2015.7
A new ionic salt, cis-[Pd(L)(PPh3)(H2O)2](SO3CF3)2 (A), in which L is an amido-functionalized N-heterocyclic carbene (NHC) ligand, has been prepared by the salt metathesis reaction between [Pd(L)(PPh3)Cl2] and AgOTf in wet acetonitrile. It was successfully characterized by NMR spectroscopy, elemental analysis, and single-crystal X-ray diffraction analysis. Complex A was found to be effective in catalyzing
一种新的离子盐,顺式-[Pd(L)(PPh3)(H2O)2](SO3CF3)2 (A),其中 L 是酰胺基官能化的 N-杂环卡宾 (NHC) 配体,由[Pd(L)(PPh3)Cl2] 和 AgOTf 在湿乙腈中的盐复分解反应。通过核磁共振谱、元素分析和单晶X射线衍射分析成功地对其进行了表征。发现配合物 A 在 Cu(OAc)2 和四正丁基溴化铵的存在下,可有效催化各种含氮和硫杂芳烃的双 C-H 官能化,以与炔烃形成稠合的多环杂芳烃化合物。吲哚、噻吩、咪唑并[1,2-a] 吡啶和咪唑用作底物。特别是,在所采用的条件下,可以获得有趣的咪唑并[5,1,2-cd]吲哚嗪化合物。