300388-53-8Relevant articles and documents
Nano cobalt ferrite encapsulated-silica particles bearing melamine as an easily recyclable catalyst for the synthesis of dihydropyrano[2,3-c]pyrazoles under green conditions
Dadaei, Mahla,Naeimi, Hossein
, (2021/07/10)
In this research, it was displayed an efficient method for synthesis of 6-amino-2,4-dihydropyrano[2,3-c] pyrazol-5-carbonitrile derivatives by using CoFe2O4 silica supported bearing melamine as a magnetic nanocatalyst. This nanocompo
An Eco-friendly Catalytic System for One-pot Multicomponent Synthesis of Diverse and Densely Functionalized Pyranopyrazole and Benzochromene Derivatives
Patil,Patil, Rupesh C.,Patil, Suresh S.
, (2019/06/24)
An external base-free, efficient, cost-effective, and environmentally benign protocol has been developed for the one-pot multicomponent synthesis of highly functionalized pyranopyrazoles and benzochromenes using water extract of Agave americana (century p
Application of Yttrium Iron Garnet as a Powerful and Recyclable Nanocatalyst for One-Pot Synthesis of Pyrano[2,3-c]pyrazole Derivatives under Solvent-Free Conditions
Sedighinia,Badri,Kiasat
, p. 1755 - 1763 (2020/01/11)
The application of yttrium iron garnet (YIG) superparamagnetic nanoparticles as a new recyclable and highly efficient heterogeneous magnetic catalyst for one-pot synthesis of pyrano[2,3-c]pyrazole derivatives under solvent-free conditions, as well as etherification and esterification reactions are described. The advantages of the proposed method include the lack of organic solvents, clean reaction, rapid removal of the catalyst, short reaction times, excellent yields, and recyclability of the catalyst.
Ce(III) immobilized on aminated poly(vinyl chloride): high-performance synergistic bifunctional acid–base catalyst for one-pot synthesis of 1,4-dihydropyrano[2,3-c]pyrazoles
Zhang, Tianzhu,Zhou, Junbin,Chen, Yang,Li, Yiqun
, p. 5329 - 5344 (2018/08/21)
A bifunctional acid–base catalyst of CeIII immobilized on ethylenediamine (EDA)-grafted poly(vinyl chloride) (PVC) has been prepared by a simple approach. First, PVC was treated with EDA to afford aminated poly(vinyl chloride) (PVC–EDA). Therea
Morpholine triflate promoted one-pot, four-component synthesis of dihydropyrano[2,3-c]pyrazoles
Zhou, Chen-Feng,Li, Jian-Jun,Su, Wei-Ke
, p. 1686 - 1690 (2016/11/11)
A one-pot, four-component reaction of ethyl acetoacetate, hydrazine hydrate, aldehydes, and malononitrile was discussed using Lewis acid catalyst morpholine triflate (MorT) to afford a series of dihydropyrano[2,3-c]pyrazoles, which were generally catalyze
Green and highly efficient synthesis of pyranopyrazoles in choline chloride/urea deep eutectic solvent
Zonouz, Adeleh Moshtaghi,Moghani, Davoud
, p. 220 - 225 (2016/03/09)
A simple and efficient multicomponent protocol, using ammonium deep eutectic solvent as a dual catalyst and environmentally benign reaction medium, is developed for the synthesis of dihydropyrano[2,3-c]pyrazole derivatives. This operationally simple proto
Green and efficient synthesis of pyranopyrazoles using [bmim][OH-] as an ionic liquid catalyst in water under microwave irradiation and investigation of their antioxidant activity
Aliabadi, Roghayeh Sharifi,Mahmoodi, Nosrat O.
, p. 85877 - 85884 (2016/09/23)
An imidazole-based ionic liquid, 1-butyl-3-methylimidazolium hydroxide ([bmim][OH-]), was utilized as a novel heterogeneous catalyst for the synthesis of pyranopyrazoles. The target pyranopyrazole compounds were isolated, purified and fully cha
A novel method for the one-pot five-component synthesis of highly functionalized pyranopyrazoles catalyzed by CuI nanoparticles
Safaei-Ghomi, Javad,Ziarati, Abolfazl,Tamimi, Mehrnoush
, p. 403 - 410 (2013/08/23)
A novel one-pot, five-component reaction for the synthesis of highly functionalized pyranopyrazoles from acid chlorides, Meldrum's acid, hydrazine hydrate, aromatic aldehydes and malononitrile in the presence of catalytic amount of CuI nanoparticles in aq
An efficient and simple approach for the synthesis of pyranopyrazoles using imidazole (catalytic) in aqueous medium, and the vibrational spectroscopic studies on 6-amino-4-(4′-methoxyphenyl)-5-cyano-3-methyl-1-phenyl-1,4- dihydropyrano[2,3-c]pyrazole using density functional theory
Siddekha, Aisha,Nizam, Aatika,Pasha
experimental part, p. 431 - 440 (2011/12/02)
We describe a one-pot four component synthesis of pyranopyroles from aryl aldehydes, ethyl acetoacetate, malononitrile and hydrazine hydrate in the presence of catalytic amounts of an organocatalyst imidazole in water as medium. A plausible mechanism for the formation of imidazole catalyzed pyranopyrazoles has been envisaged. This method is rapid, simple, provides products in good yield, and is eco-friendly. In addition, based on the optimized geometry, the frequency and intensity of the vibrational bands of 6-amino-4-(4′- methoxyphenyl)-5-cyano-3-methyl-1-phenyl-1,4-dihydropyrano[2,3-c]pyrazole were obtained by the density functional theory (DFT) calculations using 6-31G(d,p) basis set. The vibrational frequencies were calculated and the scaled values have been compared with experimental FT-IR and FT-Raman spectra. The observed and the calculated frequencies are found to be in good agreement.
Glycine-catalyzed efficient synthesis of pyranopyrazoles via one-pot multicomponent reaction
Reddy, M. B. Madhusudana,Jayashankara,Pasha
experimental part, p. 2930 - 2934 (2010/10/19)
A facile and convenient protocol is developed for the fast (5-20min) and high-yielding (85-95%) synthesis of fused pyranopyrazoles from ethyl acetoacetate, hydrazine hydrate, an aldehyde, and malononitrile in the presence of nontoxic, simple, and readily available organocatalyst glycine in aqueous medium at 25°C.
