Efficient solvent free synthesis of tertiary α-aminophosphonates using H<sub>2</sub>Ti<sub>3</sub>O<sub>7</sub>nanotubes as a reusable solid-acid catalyst
作者:Bhoomireddy Rajendra Prasad Reddy、Peddiahgari Vasu Govardhana Reddy、Bijivemula N. Reddy
DOI:10.1039/c5nj01914a
日期:——
The Kabachnik–Fields reaction was applied for the synthesis of α-aminophosphonates from aldehydes, secondary amines and dialkyl phosphites in the presence of H2Ti3O7nanotubes as reusable solid-acid catalysts.
A highly efficient and green system is introduced to chemical synthesis. Magnetic nanoparticle-supported propylsulfamic acid deposited onto hydroxyapatite [gamma-Fe2O3-HAp-(CH2)(3)-NHSO3H] synthesized as a unique heterogeneous acid catalyst of excellent activity and recyclable for at least 10 reaction runs without significant loss of activity. The facile recovery of the catalyst is carried out by applying an external magnet device. It is both "green" and efficient. The catalyst was fully characterized by spectroscopic, magnetic, adsorptive and thermal techniques (TEM, SEM, FTIR, TGA, XRD, BET, elemental analysis (CHNOS) and VSM). (C) 2010 Elsevier B.V. All rights reserved.