Cellulose sulfuric acid as a bio-supported and efficient solid acid catalyst for synthesis of pyrazoles in aqueous medium
作者:Mohammad Ali Nasseri、Mehri Salimi、Abbas Ali Esmaeili
DOI:10.1039/c4ra11440j
日期:——
A convenient and practical method was described for the regioselective synthesis of pyrazoles from hydrazines/hydrazides and 1,3-dicarbonyl compounds via the Knorr synthesis in water with cellulose sulfuricacid (CSA) as a biopolymer-based solidacidcatalyst. Various hydrazines and hydrazides were reacted with 1,3 diketones and the desired pyrazoles were obtained in high yields. The reaction of less
Mixing with microwaves: solvent-free and catalyst-free synthesis of pyrazoles and diazepines
作者:Buchi Reddy Vaddula、Rajender S. Varma、John Leazer
DOI:10.1016/j.tetlet.2013.01.029
日期:2013.3
A simple and facile condensation of hydrazines/hydrazides and diamines with 1,3-diketones/beta-ketoester leads to the preparation of pyrazoles and diazepines in high yields. This eco-friendly protocol is accelerated by microwave heating and efficiently carried out without any reaction solvent or catalyst in as little as 5 min. Published by Elsevier Ltd.
Greener and rapid access to bio-active heterocycles: room temperature synthesis of pyrazoles and diazepines in aqueous medium
作者:Vivek Polshettiwar、Rajender S. Varma
DOI:10.1016/j.tetlet.2007.11.017
日期:2008.1
An expeditious room temperature synthesis of pyrazoles and diazepines by condensation of hydrazines/hydrazides and diamines with various 1,3-diketones is described. This greener protocol was catalyzed by polystyrene supported sulfonic acid (PSSA) and proceeded efficiently in water in the absence of any organic solvent within 1-2 min. (C) 2007 Elsevier Ltd. All rights reserved.
Succinimide-N-sulfonic Acid Catalyzed One Pot, Efficient Synthesis of Substituted Pyrazoles
作者:Sagar R. Kande
DOI:10.13005/ojc/380431
日期:2022.8.31
A simple, facile and expeditious method to synthesis the pyrazoles carried out by using hydrazine/hydrazide and 1,3-dicarbonylcompounds in high yield. This eco-friendly protocol was catalyzed by succinimide-N-sulfonic acid and efficiently carried using water as a solvent within 15 minutes. The synthesized pyrazoles were characterized by H1, C13 NMR and IR spectrums.