Magnetic nanoparticle γ-Fe<sub>2</sub>O<sub>3</sub>-immobilized 1,5,7-triazabicyclo[4.4.0]dec-5-ene as a highly recyclable and efficient nanocatalyst for the synthesis of α′-oxindole-α-hydroxyphosphonates
作者:Xiao Juan Yang
DOI:10.1002/aoc.3147
日期:2014.7
Magneticnanoparticle γ‐Fe2O3‐immobilized 1,5,7‐triazabicyclo[4.4.0]dec‐5‐ene as a novel magneticnanocatalyst was synthesized and characterized. The nanoparticle reagent catalyzed efficiently the synthesis of α′‐oxindole‐α‐hydroxyphosphonates from isatins and dimethyl phosphate under solvent‐free conditions at 60 °C. More importantly, the catalyst could be easily recovered by an external magnet and
alpha(1)-Oxindole-alpha-hydroxyphosphonates were synthesized for the first time in water under neutral conditions mediated by beta-cyclodextrin in high yields. The beta-cyclodextrin can be recovered and reused without any loss of activity. (C) 2010 Elsevier Ltd. All rights reserved.
Synthesis of α1-oxindole-α-hydroxyphosphonates under catalyst-free conditions using polyethylene glycol (PEG-400) as an efficient and recyclable reaction medium
A simple, efficient, eco-friendly, and cost-effective method has been developed for the synthesis of α1-oxindole-α-hydroxyphosphonate derivatives (3a–o) by a one-pot reaction of isatins (1a–o) with trialkyl phosphites (2a–o) under catalyst-free-conditions using inexpensive, non-toxic polyethyleneglycol (PEG-400) in excellent yields (82–92%). The present methodology offers an environmental acceptability;