Results 11 to 20 of about 39,305 (203)

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   +2 more sources

Ultrasound-assisted multicomponent synthesis of 4H-pyrans in water and DNA binding studies. [PDF]

Sci Rep, 2020
A simple approach to synthesize new highly substituted 4H-pyran derivatives is described. Efficient Et3N acts as a readily accessible catalyst of this process performed in pure water and with only a 20 mol% of catalyst loading.
Auria-Luna F, Fernández-Moreira V, Marqués-López E, Gimeno MC, Herrera RP.   +4 more
europepmc   +2 more sources

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

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

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

One-pot two-step mechanochemical synthesis of arylsulfonyl 4H-pyrans

, 2022
In this paper, a simple and environment-friendly protocol was developed for the synthesis of arylsulfonyl 4H-pyrans via L-proline-catalyzed one-pot two-step reaction of aromatic aldehyde with phenylsulphonyl acetonitrile and dimedone under ball-milling ...
Qianqian Huang (1409008), Yue Cheng (24177), Ling Jiang (172296), Xiaohe Chu (5125040), Qingqing Lu (6160103)   +4 more
core   +1 more source

[DBN][HSO4]-Promoted facile and green synthesis of 2-Amino-4H-pyrans derivatives under microwave irradiation

, 2021
The [DBN][HSO4] -promoted Knoevenagel condensation followed by cyclization protocol has been developed for the first time by a successive reaction of aldehydes, dimedone and malononitrile to afford 2-Amino-4H-pyrans derivatives in high to excellent ...
Mane, Dhanjay, Mane, Vishal
core   +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