Sodium Dihydrogen Phosphate as an Efficient Catalyst for One-Pot, Three-Component Synthesis of <font>α</font>-Aminophosphonates Under Solvent-Free Conditions at Room Temperature
and general method has been developed for the one-pot, three-component synthesis of α-aminophosphonates from a condensation reaction of trimethyl phosphite, aldehydes, and amines in the presence of sodium dihydrogen phosphate under solvent-free conditions. Thus, α-aminophosphonates were synthesized relatively quickly in good yields at roomtemperature.
Nano-Cuo–Au-catalyzed solvent-free synthesis of <font>α</font>-aminophosphonates and evaluation of their antioxidant and <font>α</font>-glucosidase enzyme inhibition activities
ABSTRACT A new green and efficient method has been developed for the synthesis of α-aminophosphonates through one-potthree-componentKabachnik–Fieldsreaction. It involves the reaction of a 2-aminophenol with different substituted aromatic aldehydes and dimethyl phosphite in the presence of nanocopper oxide–gold (CuO–Au) catalyst under solvent-free conditions at 60 °C. Nano-CuO–Au catalyst was found
摘要 开发了一种绿色、高效的新方法,通过一锅三组分 Kabachnik-Fields 反应合成 α-氨基膦酸酯。它涉及在纳米氧化铜-金 (CuO-Au) 催化剂存在下,在 60 °C 的无溶剂条件下,2-氨基苯酚与不同的取代芳香醛和亚磷酸二甲酯的反应。发现纳米-CuO-Au 催化剂具有许多优点,例如高活性、简单的后处理以及良好的 (87%) 到非常高的产率 (96%)。产物通过 IR、1H、13C 和 31P NMR 光谱和元素分析进行表征。筛选所有合成化合物的体外抗氧化和α-葡萄糖苷酶抑制活性。化合物 4b 显示出较高的 2, 2-diphenyl-1-picrylhydrazyl 和 H2O2 自由基清除活性和化合物 4e 显示出比标准抗坏血酸更高的 NO 自由基清除活性。化合物4j具有比标准阿卡波糖高得多的α-葡萄糖苷酶抑制活性。图形概要
Novel bidentate <i>N</i>-coordinated alkylaluminum complexes: synthesis, characterization, and efficient catalysis for hydrophosphonylation
other alkylaluminum complexes [FlCHNPy]AlMe2(Py = 2-pyridyl) (2), [FlCHNPy]AlEt2 (Py = 2-pyridyl) (3), [FlCHNCyN(CH3)2]AlMe2 (Cy = 2-cyclohexyl) (4) and [FlCHNCyN(CH3)2]AlEt2 (Cy = 2-cyclohexyl) (5). All these complexes (1–5) were characterized using NMR spectroscopy, elemental analysis, and X-ray crystal structure analysis. The catalytic properties of these new alkylaluminum complexes for the hydrophosphonylation