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.
α-Aminophosphonates as novel anti-leishmanial chemotypes: synthesis, biological evaluation, and CoMFA studies
作者:Srikant Bhagat、Parth Shah、Sanjeev K. Garg、Shweta Mishra、Preet Kamal Kaur、Sushma Singh、Asit K. Chakraborti
DOI:10.1039/c3md00388d
日期:——
α-Aminophosphonates have been identified as novel anti-leishmanial chemotypes against theL. donovanipromastigote with low μM range activity.
α-氨基膦酸酯已被确定为针对L. donovani原虫具有低微米范围活性的新型抗利什曼病化合物。
Silver‐Catalyzed One‐Pot Three‐Component Synthesis of α‐Aminonitriles and Biologically Relevant α‐Amino‐phosphonates
作者:Vipin K. Pandey、Chandra Shekhar Tiwari、Arnab Rit
DOI:10.1002/asia.202200703
日期:2022.10.17
AbstractA simple silver salt (AgSbF6)‐catalyzed aminophosphonylation and Strecker reaction have been developed and successfully applied to a wide range of substrates (>55 substrates). This solvent‐, ligand‐, and base‐free one‐pot three‐component protocol operates effectively at room temperature to provide diversified α‐aminophosphonates and α‐aminonitriles, which gave access to the respective α‐amino amides. Importantly, the present catalyst system is also capable to produce the rarely reported and biologically relevant aminophosphonates (having anti‐leishmanial activity). Further, mechanistic studies reveal that the present phosphonylation protocol follows a radical pathway.
Magnetic nanoparticle supported polyoxometalate: An efficient and reusable catalyst for solvent-free synthesis of α-aminophosphonates
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.