Palladium dichloride adduct of N,N-bis-(diphenylphosphanylmethyl)-2-aminopyridine: synthesis, structure and catalytic performance in the decarboxylative cross-coupling of 4-picolinic acid with aryl bromide
作者:Run-Tian He、Jian-Feng Wang、Hui-Fang Wang、Zhi-Gang Ren、Jian-Ping Lang
DOI:10.1039/c4dt00815d
日期:——
Reaction of PdCl2 with N,N-bis-(diphenylphosphanylmethyl)-2-aminopyridine (bdppmapy) afforded a mononuclear complex [(bdppmapy)PdCl2] (1). Compound 1 was characterized by elemental analysis, IR, 1H, 13C and 31P NMR, electrospray ion mass spectra (ESI-MS) and X-ray single crystal crystallography. The Pd(II) center in 1 is chelated by bdppmapy, showing a cis-square planar geometry. With the assistance of additive Cu2O, complex 1 exhibited good catalytic activity toward the decarboxylative cross-coupling reactions between 4-picolinic acid and aryl bromides. In the presence of only 2 mol% catalyst, a family of 4-aryl-pyridines could be isolated in up to 83% yield.
PdCl2与N,N-bis-(diphenylphosphanylmethyl)-2-aminopyridine (bdppmapy)反应生成单核配合物[(bdppmapy)PdCl2] (1)。化合物1通过元素分析、红外光谱、1H、13C和31P NMR、电喷雾离子质谱(ESI-MS)以及X射线单晶晶体学进行了表征。1中Pd(II)中心被bdppmapy咬合,显示出顺式正方平面几何结构。在添加剂Cu2O的辅助下,配合物1在4-吡啶酸与芳基溴化物之间的去羧交叉偶联反应中表现出良好的催化活性。在仅使用2摩尔%的催化剂的情况下,能够分离出一系列4-芳基吡啶,产率高达83%。