Development of Structurally Diverse N-Heterocyclic Carbene Ligands<i>via</i>Palladium-Copper-Catalyzed Decarboxylative Arylation of Pyrazolo[1,5-<i>a</i>]pyridine-3-carboxylic Acid
作者:Khyarul Alam、Seong Min Kim、Do Joong Kim、Jin Kyoon Park
DOI:10.1002/adsc.201600480
日期:2016.8.18
pyrazolo[1,5‐a]pyridines, has been prepared using palladium‐copper‐catalyzed decarboxylative arylation of pyrazolo[1,5‐a]pyridine‐3‐carboxylic acid. Air‐stable palladium and rhodium complexes of these ligands have been synthesized via mild transmetallation of Ag‐Pyrpy‐NHC. The structural properties of Rh(Pyrpy‐NHC)(COD)Cl complexes were determined via X‐ray analysis. The measurement of the CO stretching frequencies
一系列稠合的非经典正常N-杂环卡宾的,从吡唑并[1,5-衍生Pyrpy-NHC前体一]吡啶,已经使用吡唑并钯-铜-催化的芳基化脱羧制备[1,5-一个]吡啶-3-羧酸 这些配体的空气稳定的钯和铑配合物是通过Ag-Pyrpy-NHC的轻度金属过渡合成的。Rh(Pyrpy-NHC)(COD)Cl配合物的结构性质通过X射线分析。对二羰基Rh-Pyrpy-NHC配合物的CO拉伸频率的测量表明,可以通过改变芳基的取代基来调节Pyrpy-NHC的电子给体强度。对Pd-Pyrpy-NHC配合物的催化研究表明,在环境大气条件下,Suzuki-Miyaura反应具有令人鼓舞的活性。