Results 11 to 20 of about 90,377 (200)

The Structure of Zinc Chelidonate in the Crystalline Phase, Aqueous Solution and Assessment of the Interaction with Serum Albumin [PDF]

Molecules
A zinc complex of chelidonic acid (4-oxo-4H-pyran-2,6-dicarboxylic acid) was obtained by reaction with zinc oxide under isothermal conditions. Its composition was confirmed by elemental and thermogravimetric analyses, and its molecular structure was ...
Stanislav Kozin, Victor Dotsenko, Nicolay Aksenov, Alexandr Bespalov, Alexandr Kravtsov, Oksana Lyasota, Anna Dorohova, Viacheslav Kindop, Sergei Bobrovnik, Arkady Moiseev, Lev Ivashchenko, Evgeny Gerasimenko, Tran Quang Huy, Stepan Dzhimak   +13 more
doaj   +2 more sources

Organocatalytic clean synthesis of densely functionalized 4H-pyrans by bifunctional tetraethylammonium 2-(carbamoyl)benzoate using ball milling technique under mild conditions

Green Chemistry Letters and Reviews, 2016
A green and simple method has been developed for efficient preparation of diverse annulated 2-amino-3-cyano-4H-pyran derivatives in the presence of a low loading of tetraethylammonium 2-(carbamoyl)benzoate (TEACB), as a bifunctional organocatalyst, under
Mohammad G. Dekamin, Mohammad Alikhani, Shahrzad Javanshir   +2 more
doaj   +2 more sources

Ni–Unsymmetrical Salen Complex-Catalyzed One-Pot Multicomponent Reactions for Efficient Synthesis of Biologically Active 2‑Amino-3-cyano‑4H‑pyrans [PDF]

ACS Omega
Sushree Aradhana Patra, Monojit Nandi, Mannar R. Maurya, Gurunath Sahu, Deepika Mohapatra, Hans Reuter, Rupam Dinda   +6 more
doaj   +2 more sources

Green Synthesis of 4H-Pyrans and 4H-Chromenes in Magnetized Distilled Water [PDF]

Iranian Journal of Chemistry & Chemical Engineering, 2023
An efficient, facile, and green synthesis of 4H-pyran and 4H-chromene derivatives in Magnetized Distilled Water (MDW) has been described. In this work, magnetized distilled water was applied as a green-promoting medium for a practical, and ...
Mohammad Bakherad, Ali Keivanloo, Hossein Rezaei, Amin Rezaeifard   +3 more
doaj   +1 more source

Synthesis of 2-amino-4H-pyran and 2-benzylidene malononitrile derivatives using a basil seed as a cheap, natural, and biodegradable catalyst

Current Research in Green and Sustainable Chemistry, 2022
Developing green and sustainable principles in catalytic systems using natural materials is becoming a suitable strategy to reduce the possible pollutant with high-risk agents.
Eskandar Kolvari, Nadiya Koukabi, Zohreh Ozmaei, Hadise Khoshkho, Farzad Seidi   +4 more
doaj   +1 more source

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   +1 more source

Cu-phthalocyanine Coated Hybrid Magnetic Nanoparticles: Preparation and Application in the Synthesis of Mono- and Bis pyrano[2,3-d]pyrimidinones and mono- and Bis-2-amino-4H-pyrans [PDF]

Iranian Journal of Chemistry & Chemical Engineering, 2020
In this research, Cu-phthalocyanine coated hybrid magnetic nanoparticles have been prepared in a simple method and evaluated as an efficient catalyst in the preparation of mono- and bis-pyrano[2,3-d]pyrimidinones and mono- and bis-2-amino-4H-pyrans from ...
Ali Reza Karimi, Fatemeh Bagherian, Marzie Karimi   +2 more
doaj   +1 more source

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   +1 more source

Synthesis of novel tetrahydroquinoline derivatives from α,α′-bis(substituted-benzylidene)cycloalkanones

Journal of Saudi Chemical Society, 2016
In this paper, we describe a two-step synthesis of a series of substituted tetrahydroquinoline analogies. In the first step α,α′-bis(substituted-benzylidene)cycloalkanones are reacted with malononitrile to afford 2-amino-3-cyano-4H-pyrans.
Enayatollah Sheikhhosseini, Elinaz Farrokhi, Mohammad Ali Bigdeli   +2 more
doaj   +1 more source

One-pot, three-component, selective synthesis of the polyfunctionalized 4H-pyran and 4H-benzo[b]pyran derivatives in the presence of a highly efficient molecular sieve-supported zinc catalyst

Green Processing and Synthesis, 2018
A series of pentasubstituted 4H-pyrans and tetrahydrobenzo[b]pyrans are synthesized with excellent yields via a one-pot condensation of aromatic aldehydes, malononitrile, and a dicarbonyl compound, ethyl acetoacetate, acetyl-acetone or dimedone, in the ...
Magyar Ágnes, Hell Zoltán
doaj   +1 more source