Magnetic nanoparticle supported polyoxometalate: An efficient and reusable catalyst for solvent-free synthesis of α-aminophosphonates
摘要:
A new magnetically separable catalyst consisting of phosphotungstic acid (PTA) supported on imidazole functionalized silica coated cobalt ferrite nanoparticles was prepared. The synthesized catalyst was characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), vibrating sample magnetometry (VSM), thermogravimetric analysis (TGA), Fourier transform infrared (FT-IR), and inductively coupled plasma atomic emission spectroscopy (ICP-AES). The immobilized phosphotungstic acid was shown to be an efficient heterogeneous catalyst for the synthesis of alpha-aminophosphonates under solvent-free conditions at room temperature. The catalyst is readily recovered by simple magnetic decantation and can be recycled several times with no significant loss of catalytic activity. (C) 2013 Elsevier B.V. All rights reserved.
Highly efficient one-pot multi-component synthesis of α-aminophosphonates and bis-α-aminophosphonates catalyzed by heterogeneous reusable silica supported dodecatungstophosphoric acid (DTP/SiO2) at ambient temperature and their antitubercular evaluation against Mycobactrium Tuberculosis
作者:Shafeek A. R. Mulla、Mohsinkhan Y. Pathan、Santosh S. Chavan、Suwara P. Gample、Dhiman Sarkar
DOI:10.1039/c3ra45853a
日期:——
A highly efficient one-pot multi-component reaction (MCR) protocol over DTP/SiO2 has been developed for the synthesis of α-aminophosphonate derivatives (4aâx) in excellent yields. The α-aminophosphonate derivatives were for the first time evaluated for their antitubercular activity against the M. tuberculosis H37Ra (MTB) strain. An evaluation of the data on the cytotoxicity and antimicrobial activity shows that 4n and 4v are promising antitubercular agents.
Graphene Oxide as Recyclable Catalyst for One-Pot Synthesis of α-Aminophosphonates
作者:Kiran B. Dhopte、Dnyaneshwar S. Raut、Anand V. Patwardhan、Parag R. Nemade
DOI:10.1080/00397911.2014.989447
日期:2015.3.19
Abstract We report the synthesis of α-aminophosphonates from aromatic aldehydes, aromatic and aliphatic amines, and trimethylphosphite (Kabachnik–Fieldsreaction) using a “carbocatalyst,” graphene oxide, at room temperature with excellent yield and recyclability. Enhanced catalytic activity of graphene oxide as compared to other catalysts studied is possibly due to the presence of carboxylic acid and
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.
biologically significant scaffolds via a multicomponent reaction of aldehydes, amines, and tri(alkyl/aryl)phosphites to synthesize secondary and tertiary α-aminophosphonates (APs), in addition to a carbon–carbon bond-forming reaction to synthesizingbis(indolyl)methanes (BIMs) from aldehydes and indolyl compounds. PDESs proved to be highly efficient catalysts for these transformations, providing mild