Hydrotris[3-(1-naphthylpyrazol-1-yl)]borate and Hydrotris[3-(2-naphthylpyrazol-1-yl)]borate: Two Novel Homoscorpionate Ligands of Varying Coordination Behavior
Cu(OAc)2·H2O-catalyzed N-arylation of nitrogen-containing heterocycles
作者:Zhong-Lin Xu、Hong-Xi Li、Zhi-Gang Ren、Wei-Yuan Du、Wei-Chang Xu、Jian-Ping Lang
DOI:10.1016/j.tet.2011.05.025
日期:2011.7
In the absence of any additional ligands, the efficientN-arylation of nitrogen-containing heterocycles with aryl iodides catalyzed by relative low catalyst amount of Cu(OAc)2·H2O was developed. This simple catalytic system is involved in the C–N cross-coupling reaction and works for a variety of pyrazole, pyrrole, imidazole, triazole, indole, benzoimidazole, benzotriazole, carbazole, and anilines
Retracted Article: Molybdenum-silver co-catalyzed cycloaddition of alkynes with <i>N</i>-isocyanoiminotriphenylphosphorane (NIITP): an efficient strategy for the synthesis of monosubstituted pyrazoles
作者:Pengbing Mi、Jiajia Lang、Shaojian Lin
DOI:10.1039/c9cc03363g
日期:——
A new molybdenum-silver co-catalyzed [3+2] cycloaddition of alkynes with N-isocyanoiminotriphenylphosphorane (NIITP) has been described. The NIITP serves as a non-toxic, facile “CNN” source. Over 30 substrates were successfully converted to the desired compounds in good to excellent yields.
Trinuclear Diamagnetic Nickel(II) Complexes with Bridging 3‐Arylpyrazolato Ligands
作者:Kifah S. M. Salih、Susann Bergner、Harald Kelm、Yu Sun、Anneken Grün、Yvonne Schmitt、Roland Schoch、Mark Busch、Naina Deibel、Stefan Bräse、Biprajit Sarkar、Matthias Bauer、Markus Gerhards、Werner R. Thiel
DOI:10.1002/ejic.201300925
日期:2013.12.2
Orange-red trinuclearnickel(II) complexes are obtained by reacting Ni(ClO4)2(H2O)6 with 3(5)-arylpyrazoles in the presence of a base. Herein, the diamagnetic nickel centers are coordinated in a square-pyramidal manner by four pyrazolato ligands, each of which bridges two nickel sites. The structurally unique complexes were investigated by NMR, IR, fluorescence, and X-ray spectroscopy. All seven compounds
在碱存在下,通过 Ni(ClO4)2(H2O)6 与 3(5)-芳基吡唑反应获得橙红色三核镍 (II) 配合物。在此,抗磁性镍中心通过四个吡唑根基配体以方形锥体方式配位,每个配体桥接两个镍位点。通过 NMR、IR、荧光和 X 射线光谱研究了结构独特的配合物。这里描述的所有七种化合物都通过单晶 X 射线衍射在结构上阐明。以 3(5)-二茂铁基吡唑为底物,获得了具有六个氧化还原活性二茂铁基部分的非金属体系。
Synthesis, characterization and crystal structures of two 2-naphthyl substituted pyrazoles
作者:Guang Yang、Raphael G. Raptis
DOI:10.1002/jhet.5570400416
日期:2003.7
The synthesis, characterization and X-raycrystalstructures of two 2-naphthyl-substituted pyrazoles - 3-(2-naphthyl) pyrazole (1) and 5-(2-naphthyl)-3-trifluoromethyl-pyrazole (3) - are reported. In addition, the isolation and structural characterization of 5-hydroxy-3-(2-naphthyl)-5-trifluoromethyl-4,5-dihydropyrazole (2), an intermediate of the synthesis of 3, is included. Two simple methods of
Rhodium(III)-Catalyzed Oxidative Coupling of 5-Aryl-1<i>H</i>-pyrazoles with Alkynes and Acrylates
作者:Xingwei Li、Miao Zhao
DOI:10.1021/jo201530r
日期:2011.10.21
[RhCp*Cl2]2-catalyzed oxidative coupling of 5-aryl-1H-pyrazoles with alkynes and acrylates has been achieved using Cu(OAc)2 as an oxidant. Coupling with alkynes afforded six-membered azacycles as a result of C–C and C–N coupling. Coupling with acrylates followed a process of diolefination and a subsequent aza-Michael cyclization.