Application of Fe3O4@SiO2@sulfamic acid magnetic nanoparticles as recyclable heterogeneous catalyst for the synthesis of imine and pyrazole derivatives in aqueous medium
作者:B. Zakerinasab、M. A. Nasseri、H. Hassani、M. M. Samieadel
DOI:10.1007/s11164-015-2204-1
日期:2016.4
Sulfamic acid supported on Fe3O4@SiO2 superpara magnetic nanoparticles was successfully applied as a recyclable solid acid catalyst with a large density of sulfamic acid groups for the synthesis of pyrazole derivatives, an important class of potentially bioactive compounds. The products are obtained in high yield from the one-pot reaction procedure involving dicarbonyl compounds and hydrazines/hydrazides. This new method totally avoids the use of toxic or expensive solvents and organic acids in this reaction.
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
Pudovik, A. N.; Sobanov, A. A.; Bakhtiyarova, I. V., Journal of general chemistry of the USSR, 1983, vol. 53, # 12, p. 2404 - 2406
作者:Pudovik, A. N.、Sobanov, A. A.、Bakhtiyarova, I. V.、Zimin, M. G.
DOI:——
日期:——
Synthesis of Novel 1-<i>H</i>-Pyrazole-4-carboxylic Acid Esters by Conventional and Microwave Assisted Vilsmeier Cyclization of Hydrazones
作者:Radhakrishnan Sridhar、Paramasivan T. Perumal
DOI:10.1081/scc-120018766
日期:2003.1.5
A convenient method for the synthesis of 1H-pyrazole-4-carboxylic acid esters is described. A comparison between the conventional and microwave assisted Vilsmeier reaction is carried out.
PEG–SO3H as a mild, efficient and green catalytic system for the synthesis of pyrazole derivatives in aqueous medium
作者:M. A. Nasseri、S. A. Alavi、B. Zakeri Nasab
DOI:10.1007/s13738-012-0143-y
日期:2013.4
A versatile, alternative and environmentally benign strategy for the synthesis of a series of pyrazoles has been successfully performed in water using PEG–SO3H as an acidic catalyst. The products are obtained in high yield from the one-pot reaction procedure involving dicarbonyl compounds and hydrazines/hydrazides. This new method totally avoids the use of organic acids and toxic or expensive solvents in this reaction. The catalyst is waste-free, easily prepared, and efficiently re-used.