Results 11 to 20 of about 51,192 (201)

Synthesis of Fe3O4@SiO2@Pr-NH2@DAP as a magnetic recyclable nano-catalyst for efficient synthesis of pyranothiazolopyrimidines and 4H-pyrans under solvent-free condition [PDF]

Scientific Reports, 2023
In this research, we describe the synthesis of silica-coated nano-Fe3O4 particles, which were successfully modified by diaminopyrimidine, and their physicochemical properties were characterized using FT-IR, XRD, TEM, FE-SEM, EDX, EDX-mapping, and TGA ...
Maryam Danehchin, Abbas Ali Esmaeili
doaj   +3 more sources

Solvent-free mechanochemical multicomponent preparation of 4H-pyrans catalyzed by Cu2(NH2-BDC)2(DABCO) metal-organic framework [PDF]

Heliyon, 2023
4H-pyrans have been prepared through a mechanochemical multicomponent reaction (MCR) of different aldehydes, malononitrile, and various 1,3-dicarbonyl compounds, catalyzed by an amine-functionalized metal-organic framework (MOF) Cu2(NH2-BDC)2(DABCO) as a
Zahra Akhlaghi, Mohammad R. Naimi-Jamal, Leila Panahi, Mohammad G. Dekamin, Bahareh Farasati Far   +4 more
doaj   +2 more sources

Ternary hydrotalcites in the multicomponent synthesis of 4H-pyrans [PDF]

Catalysts, 2020
Lamellar double hydroxides (LDH) with double divalent cations were synthesized by the co-precipitation method and studied in the multicomponent synthesis of 4H-pyrans.
Rojas, Hugo, Romanelli, Gustavo Pablo, Martínez, José J., Martínez Zambrano, José Jobanny, Hugo A. Rojas, Sathicq, Ángel, Nope Vargas, Eliana Rocio, José J. Martínez, Gustavo P. Romanelli, Rafael Luque, Sathicq, Angel Gabriel, Luque, Rafael, Romanelli, Gustavo P., Rojas, Hugo A., Nope, Eliana, Eliana Nope, Ángel G. Sathicq   +16 more
core   +7 more sources

Starch-derived magnetic nanoparticles (Fe3O4@C-SO3H): Synthesis, Characterization and Its application on the preparation of dihydropyrano[c]chromenes, 2‑Amino-3-cyano‑4H‑pyrans and 2-amino-4H-chromenes derivatives [PDF]

شیمی کاربردی روز, 2019
In this study, a novel biomass and Starch-derived carbonaceous solid acid catalyst (Fe3O4@C-SO3H) that has superparamagnetism with high acid density was successfully prepared for the first time by incomplete hydrothermal carbonization of Starch followed ...
Fatemeh Khorsi Damghani, Seied Ali Pourmousavi, Hamzeh Kiyani   +2 more
doaj   +3 more sources

Synthesis of Polyfunctionalized 4H-Pyrans [PDF]

Journal of Chemistry, 2013
Amberlyst A21 catalyzed one-pot three-component coupling of aldehyde and malononitrile with active methylene compounds such as acetylacetone and ethyl acetoacetate for the synthesis of pharmaceutically important polyfunctionalized 4H-pyrans has been ...
Manisha Bihani, Pranjal P. Bora, Ghanashyam Bez   +2 more
doaj   +2 more sources

Introducing a CoFe2O4@CS-BAPT/CuII nanocomposite as an efficient catalyst for the synthesis of 4H-pyran derivatives [PDF]

Nanoscale Advances
This study introduces the development of an innovative and environmentally friendly bio-nanocatalyst (CoFe2O4@CS-BAPT/CuII nanocomposite), designed and employed for three-component synthesis of 2-amino-3-cyano-4H-pyrans.
Mohammad Ali Bodaghifard, Najmieh Ahadi, Mojdeh Ordouzadeh   +2 more
doaj   +2 more sources

L-glutamine-functionalized magnetic polystyrene for highly efficient synthesis of 2-amino-4H-pyrans [PDF]

Discover Nano
In this study, we reported the synthesis and characterization of a novel magnetic polystyrene nanocatalyst functionalized with L-glutamine (L-Glu-MPS) and evaluation of its catalytic performance in a multicomponent organic reaction for the preparation of
Fatemeh Zahra Hajian, Sakineh Asghari, Ghasem Firouzzadeh Pasha, Taraneh Abbaspour, Mahmood Tajbakhsh, Fatemeh Zare   +5 more
doaj   +2 more sources

Potassium phthalimide promoted green multicomponent tandem synthesis of 2-amino-4H-chromenes and 6-amino-4H-pyran-3-carboxylates [PDF]

Journal of Saudi Chemical Society, 2014
A one-pot efficient, green, practical, and environmentally friendly multicomponent synthesis of 5-oxo-4-aryl-5,6,7,8-tetrahydro-4H-chromenes, ethyl-6-amino-4-aryl-5-cyano-2-methyl-4H-pyran-3-carboxylates as well as 2-amino-4-aryl-7-hydroxy-4H-chromene-3 ...
Hamzeh Kiyani, Fatemeh Ghorbani
doaj   +2 more sources

Convenient One-Pot Synthesis of Spirooxindole-4H-pyrans in the Presence of SBA-Pr-NH2 and Evaluation of their Urease Inhibitory Activities [PDF]

Journal of Nanostructures, 2012
A simple and efficient one-pot three-component synthesis of the biologically important spirooxindole-4H-pyrans was carried out by the reaction of isatin, activated methylene reagents, and 4- hydroxycoumarin in aqueous medium. SBA-Pr-NH2 was found to be
G. Mohammadi Ziarani, N. Hosseini Mohtasham, N. Lashgari, A. Badiei, M. Amanlou, R. Bazl   +5 more
doaj   +3 more sources

Zn complexed on hybrid manganese doped cobalt ferrite nanoparticles covered by silica as a catalyst in the synthesis of 2-amino-4H-pyran and N- arylquinoline derivatives [PDF]

Heliyon
In the present work, Zn complexed on hybrid manganese doped cobalt ferrite nanoparticles covered by silica were synthesized. These MNPs were characterized using different techniques including Fourier-transform infrared spectroscopy (FT-IR), X-ray ...
Najmieh Ahadi, Akbar Mobinikhaledi, Amir Hossain Ebrahimi   +2 more
doaj   +2 more sources