Magnetic Fe<sub>3</sub>O<sub>4</sub>Nanoparticle-Supported Phosphotungstic Acid as a Recyclable Catalyst for the Kabachnik-Fields Reaction of Isatins, Imines, and Aldehydes under Solvent-Free Conditions
作者:Mohd Nazish、S. Saravanan、Noor-ul H. Khan、Prathibha Kumari、Rukhsana I. Kureshy、Sayed H. R. Abdi、Hari C. Bajaj
DOI:10.1002/cplu.201402191
日期:2014.9.22
reaction of isatins, imines, and aldehydes using dimethyl and diethylphosphite as a nucleophile to give the corresponding α‐hydroxy and α‐amino phosphonates in excellent yields for a wide range of substrates. The reaction conditions were simple, green, and efficient. The catalyst was recycled up to five times with retention of its activity. Based on the NMR spectroscopy studies, a probable catalytic cycle
Amberlyst-15 Catalyzed Synthesis of α′-Oxindole-α-Hydroxyphosphonates under Ultrasonic Irradiation
作者:Kunda Uma Maheswara Rao、Guda Dinneswara Reddy、Chan-Moon Chung
DOI:10.1080/10426507.2012.736099
日期:2013.8.1
An efficient and environment friendly protocol for the synthesis of -oxindole--hydroxyphosphonates by the condensation of substituted isatin and dialkylphosphite in the presence of amberlyst-15 is reported. This reaction gives good to excellent yields of products under heating and sonication conditions. Supplementary materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfer, and Silicon and the Related Elements for the following free supplemental files: Additional figures.
Novel aqueous phase supramolecular synthesis of α 1 -oxindole-α-hydroxyphosphonates
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.