One-Pot Three-Component Synthesis of<i>Hantzsch</i>1,4-Dihydropyridines Promoted by Dimethyl Phosphate Ionic Liquids
作者:Elina Priede、Andris Zicmanis
DOI:10.1002/hlca.201500009
日期:2015.8
one‐pot three‐component reaction of ethyl acetoacetate, AcONH4, and different aldehydes has been successfully performed in the presence of ionic liquids (ILs) possessing a (MeO)2PO counterion. The impact of electronic and steric effects of the substituents of aromaticaldehydes, as well as the influence of different anions of ILs on the product yield, have been investigated. The application of dimethyl
USE OF COMPOSITIONS OBTAINED BY CALCINING PARTICULAR METAL-ACCUMULATING PLANTS FOR IMPLEMENTING CATALYTICAL REACTIONS
申请人:CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE
公开号:US20150376224A1
公开(公告)日:2015-12-31
The use of metal-accumulating plants for implementing chemical reactions especially catalytical reactions.
金属积累植物用于实现化学反应,特别是催化反应的使用。
USY-zeolite catalyzed synthesis of 1,4-dihydropyridines under microwave irradiation: structure and recycling of the catalyst
作者:Leonardo H.R. Alponti、Monize Picinini、Ernesto A. Urquieta-Gonzalez、Arlene G. Corrêa
DOI:10.1016/j.molstruc.2020.129430
日期:2021.3
therapeutically and also as visible‐light photoredox catalysts. In this work we report the application of an ultra-stable (US) Y zeolite as a promising green catalyst in the synthesis of a series of 1,4-dihydropyridines undermicrowaveirradiation. Using the optimized reaction conditions, 21 compounds were prepared in 64-96% isolated yields. The recovery and recycle of the USY zeolite are also reported as well
biomimetic aerobic oxidative synthesis of 2-substituted quinazolines and Hantzsch pyridines from the oxidative cyclocondensation of 2-aminobenzylamine and aldehydes and the oxidative aromatization of 1,4-dihydropyridines, respectively. The products were obtained in good to high yields in a phosphate buffer (0.1 M, 12.5 mL, pH 4.5) and acetonitrile (4 vol%) mixture as a solvent. These methods are more
An Expeditious Oxidative Aromatization of Hantzsch 1,4-Dihydropyridines to Pyridines Using Cetyltrimethylammonium Peroxodisulfate: A Phase Transferring Oxidant
作者:Parvin Kumar、Ashwani Kumar
DOI:10.5012/bkcs.2010.31.8.2299
日期:2010.8.20
A new approach to the use of potassium peroxodisulphate as an oxidizing reagent is proposed and applied to the case of oxidativearomatization of 1, 4-dihydropyridines with cetyltrimethylammonium peroxodisulfate, a phase transfer oxidant. We demonstrate how it is possible to increase the reactivity of potassium peroxodisulphate in the presence of phase transfer catalyst. Dealkylation in case of 4-n-alkyl/n-alkenyl