Results 31 to 40 of about 51,192 (201)

Mesoporous KIT-6 Supported Ionic Liquids as New and Highly Effective Heterogeneous Catalysts for Three-component Synthesis of 2-Amino-3-cyano-4H-pyrans [PDF]

, 2021
A series of mesoporous KIT-6 supported ionic liquids were prepared and tested as effective and practical catalysts for the synthesis of 2-amino-3-cyano-4H-pyrans.
Li, Jing Rui, Chen, Chen, Hu, Yu Lin
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

Sustainable alternative protocols for the multicomponent synthesis of spiro-4H-pyrans catalyzed by 4-dimethylaminopyridine

, 2022
Green approaches to the synthesis of spiro-4. H-pyrans are reported based on the one-pot and three-component condensation via a domino Knoevenagel /Michael /cyclization sequence.
Mohamed MahmoudNasef (12004555), Masoumeh Zakeri (1551499), Arezoo Moharami (12004558), Majid Mommahed Heravi (9225485), Ebrahim Abouzari-Lotf (3125853)   +4 more
core   +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

Computational Study on the Acid Catalyzed Reactions of Fluorine-Containing 2,4-Dialkoxy-3,4-dihydro-2H-pyrans with Aromatic Compounds

Applied Sciences, 2012
The reaction of 2,4-diethoxy-6-trifluoromethyl-3,4-dihydro-2H-pyran (1) with aromatic compounds in refluxing acetonitrile in the presence of p-toluenesulfonic acid gave the mixture of 4-aryl-2-trifluoromethyl-4H-pyrans (3) and 6-aryl-1,1,1-trifluorohexa ...
Norio Ota, Yasuhiro Kamitori, Ryusuke Shirai, Mizuki Hatakenaka, Etsuji Okada   +4 more
doaj   +1 more source

Grindstone Chemistry: An Efficient and Green Synthesis of 2-Amino-4H-benzo[b]pyrans [PDF]

, 2017
A single step, mild, environmentally friendly green method has been developed for the synthesis of physiologically active 2-amino-4H-benzo[b]pyrans employing solid sodium ethoxide as catalyst under solvent free conditions at room temperature via grinding.
Thangamani, Arumugam, Arumugam Thangamani   +1 more
core   +1 more source

Chiral Cyclopentadienyl Ruthenium Complexes as Versatile Catalysts for Enantioselective Transformations

CHIMIA, 2017
Ruthenium complexes, in particular cyclopentadienyl ruthenium (??) derivatives, catalyze a vast number of transformations in the field of homogenous catalysis.
David Kossler, Nicolai Cramer
doaj   +1 more source

4H kumppanina harrastamisen Suomen mallissa [PDF]

, 2021
Opinnäytetyössä selvitettiin 4H:n kumppanuutta harrastamisen Suomen mallissa. Harrastamisen Suomen malli on yksi Valtion nuorisopoliittisen ohjelman toimenpiteistä, jolla tuetaan lasten ja nuorten harrastustoimintaa.
Hietala, Heli
core  

Synthesis of Some Aldoxime Derivatives of 4H-Pyran-4-ones [PDF]

Molecules, 2002
Aldoxime derivatives of 4H-pyran-4-ones 4-7a,b have been synthesized by the reaction of di(aminoxymethyl) pyranones 3a,b with aromatic aldehydes.
Abrishami, Fateme, Teimuri-Mofrad, Reza, Bayat, Yadollah, Shahrisa, Aziz   +3 more
openaire   +2 more sources

Synthesis and Antimicrobial Evaluation of 4H-Pyrans and Schiff Bases Fused 4H-Pyran Derivatives as Inhibitors of Mycobacterium bovis (BCG).

Iranian journal of pharmaceutical research : IJPR, 2018
The focus of our study is the synthesis and biological activity evaluation of a series of 4H-Pyran compounds and schiff bases fused 4H-Pyran derivatives which are known to possess a wide variety of biological activities. In this paper at first a simple and efficient one-pot synthesis of 4H-Pyran s from the three-component reaction between malononitrile,
Mahdavi, Seyedeh Mahbobeh, Habibi, Azizollah, Dolati, Hadi, Shahcheragh, Seyyed Mohammad, Sardari, Soroush, Azerang, Parisa   +5 more
openaire   +2 more sources