据报道,一种基于包含丰富且廉价的锰以及易于获得的氨基三唑配体的络合物的催化系统。新的Mn(I)配合物在以2-丙醇为氢源的酮类转移氢化中具有催化能力。该反应在 80 °C 的温和条件下进行 20 小时,催化剂负载量为 3%,使用 KO t Bu 或 NaOH 作为碱。对于具有广泛官能团耐受性的宽底物范围,获得了良好到优异的产率。通过改变配体的取代模式获得的结果与氢转移的外球机制一致。
Manganese(I) complexes bearing triazole ligands are reported as catalysts for the hydrosilylation of carbonyl and carboxyl compounds. The desired reaction proceeds readily at 80 °C within 3 hours at catalyst loadings as low as 0.25 to 1 mol%. Hence, good to excellent yields of alcohols could be obtained for a wide range of substrates including ketones, esters, and carboxylic acids illustrating the
Propargyl functionalized diazenes 1 were prepared by two different approaches and were examined as alkyne click components in copper-catalyzed azide–alkyne cycloadditions (CuAAC) with 2-(azidomethyl)pyridine 5a and four α-azido-ω-aminoalkanes C2–C5 (5b–e). Whereas the reactions with azidoalkylamines 5b–e reached completion with copper(II) sulfate without the need of reducing agent typically in no more
Synthesis, characterization and catalytic activity of novel ruthenium complexes bearing NNN click based ligands
作者:Roberto Sole、Marco Bortoluzzi、Anke Spannenberg、Sergey Tin、Valentina Beghetto、Johannes G. de Vries
DOI:10.1039/c9dt01822k
日期:——
available reagents. The rutheniumcomplexes were obtained by heating the Ru(PPh3)3Cl2 precursor and the tridentate NNN ligand in toluene under reflux for 2 hours, achieving yields of 82–87%. These complexes were fully characterized by means of NMR, FT-IR and high resolution ESI spectroscopy. The crystal structure of one of the complexes was determined. These complexes showed excellent activity and
determined by single-crystal X-ray diffraction. The complex is highly stable, active and selective toward the copper-catalyzed azide-alkyne cycloaddition, working in neat conditions and in the absence of bases at roomtemperature. Substrate scope was assessed by testing several different alkynes and azides. In most cases the corresponding 1,4-disubstituted-1,2,3-triazoles were isolated in high yields.