N-Heterocyclic carbene adducts of cyclopalladated ferrocenylpyridine: Synthesis, structural characterization and reusable catalytic system for Suzuki and amination of aryl chlorides in poly(ethylene glycol-400)

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• 作者：Chen Xu^a ; ^{xubohan@163.com} ; Hong-Mei Li^b ; Hu Liu^b ; Zhi-Qiang Zhang^b ; Zhi-Qiang Wang^a ; Wei-Jun Fu^a ; Yu-Qing Zhang^b ; ^{zhangyq8@126.com}
• 关键词：N-Heterocyclic carbene adduct ; Palladacycle ; Crystal structure ; Suzuki coupling ; Amination
• 刊名：Inorganica Chimica Acta
• 出版年：2012
• 期刊代码：40_00201693
• 类别：ch
• 出版时间：15 May, 2012
• 卷：386
• 期：Complete
• 页码：22-26
• 文件大小：1068 K

摘要

Two air-stable carbene adducts of cyclopalladated ferrocenylpyridine 1-2 have been synthesized and characterized by elemental analysis, IR, ESI-MS, ¹H and ¹³C NMR. Additionally, their detailed structures have been determined by single-crystal X-ray analysis. The use of these complexes as catalysts for the Suzuki and Buchwald-Hartwig amination of aryl chlorides was examined. Compound 2 was found to be very efficient for these reactions. Typically, using 0.5-1 mol%of catalyst in the presence of 3 equivalents of K^tOBu as base in PEG-400 [poly(ethylene glycol-400)] at 120 掳C provided coupling products in excellent yields. Moreover, the 2/PEG-400 system could be recycled and reused three times.