Highly efficient metal-free one-pot synthesis of <font>α</font>-aminophosphonates through reduction followed by Kabachnik–fields reaction using three-component system
ABSTRACT One-potsynthesis of α-aminophosphonates directly from aryl nitro compounds, aldehydes/ketones, and diethyl phosphite using sodium dithionite through reduction and followed by Kabachnik–Fields reaction under metal-free conditions is reported. The major advantages are excellent yield, high chemoselectivity, neutral reaction medium, and simple experimental procedure. This methodology consists
Commercially available titanocene dichloride was firstly used as an extremely efficient catalyst for a three component one-pot reaction of an amine, an aldehyde (ketone), and a dialkyl phosphite to form α-aminophosphonates under solvent-free conditions at ambient temperature in good to high yields, providing a green, rapid and convenient method for the synthesis of α-aminophosphonates.
Cd(ClO4)2∙xH2O as a novel catalyst for the synthesis of α-aminophosphonates under solvent-free conditions
作者:Someshwar D. Dindulkar、Mudumala Veeranarayana Reddy、Yeon Tae Jeong
DOI:10.1016/j.catcom.2011.10.025
日期:2012.1
we report cadmium perchlorate hydrate to be an novel, expeditious catalyst for the three-component one-pot reaction of an amine, an aldehyde and a H-phosphonate diesters in open air without any solvent, leads to α-aminophosphonates in excellent yields. To the best of our knowledge this finding is the first example of a cadmium perchlorate hydrate catalyzedKabachnik-Fieldsreaction.
A novel magnetic BrOnsted acid catalyst was synthesized based on growing poly(amidoamine) dendrimers on the surface of magnetic nanoparticles. After the dendronizing process, the MNP coated PAMAM was functionalized by chlorosulfuric acid to form an acid catalyst. Because of dendrimer coating of MNPs, catalyst shows good loading level of acidic groups on the surface. Also zwitterion nature of catalyst surface improves the catalytic activity. This new catalyst is proven to be highly effective in the synthesis of alpha-aminophosphonate compounds in a green way. (C) 2012 Elsevier B.V. All rights reserved.
Magnetic BaFe12O19/Al2O3: An Efficient Heterogeneous Lewis Acid Catalyst for the Synthesis of α-Aminophosphonates (Kabachnik–Fields Reaction)
critical for improving the chemical synthesis process. Therefore, BaFe12O19/Al2O3, a magnetic mesoporous nanocomposites, were designed synthesized and characterized using different techniques such as energy dispersive X-ray (EDX) spectroscopy, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FESEM), Brunauer–Emmett–Teller (BET) adsorption