site‐selective C3‐arylation of N‐methyl‐2‐oxindole with arylboronic acids at room temperature in aqueous media to yield a series of 3‐aryl‐N‐methyl‐2‐oxindoles. This catalytic reaction progressed well with a low catalyst loading (0.01 mol %) under open‐flask conditions. Notably, a column‐chromatography‐free method for the quantitative preparation of C3‐arylated N‐methyl‐2‐oxindoles is reported. The catalyst
两种新型Pd II ONO钳形络合物可有效地用作均相催化剂,用于在室温下在水性介质中将N-甲基-2-氧吲哚与芳基硼酸进行定点C3芳基化,生成一系列3-芳基-N-甲基-2-氧吲哚 在开瓶条件下,该催化剂的催化反应进展顺利,催化剂负载量低(0.01 mol%)。值得注意的是,据报道,采用了无柱色谱法定量制备C3芳基化的N-甲基-2-氧吲哚。该催化剂与多种底物表现出良好的相容性,并在多达五个连续运行中具有可回收性,而没有明显的收率损失。
Synthesis, characterization, structures, and catalytic property of oxovanadium(V) complexes with hydrazone ligands
作者:N. Wang、J. Y. Guo、J. Y. Hu
DOI:10.1134/s1070328413120087
日期:2013.12
The reaction of [VO(Acac)(2)] with 4-methyl-N'-[(2-hydroxy-1-naphthyl)methylidene]benzohydrazide (H2L1) and 4-methyl-N'-[1-(2-hydroxynaphthyl)ethyiidene]benzohydrazide (H2L2), respectively, in methanol, affords two new oxovanadium(V) complexes [VO(OMe)L-1](2) (I) and [VO(OMe)L-2] (II). Both complexes have been characterized by elemental analysis, IR, and single crystal X-ray diffraction methods. Complex I is a methoxide-bridged dinuclear oxovanadium(V) compound, while complex II is a mononuclear oxovanadium(V) compound. The dinegative hydrazone ligands coordinate to the metal atoms through phenolate, imine, and deprotonated amide donor atoms. The geometry around vanadium atom in I is a distorted VNO5 octahedron, while that in II is a VNO4 square pyramid. Both complexes have effective catalytic property for the sulfoxidation reaction.