نتایج جستجو برای: chromene derivatives

تعداد نتایج: 105503  

Journal: :iranian journal of catalysis 2014
esmayeel abbaspour-gilandeh seyyedeh cobra azimi

the ionic liquid li(ohch2ch2nh2)(cf3oac) was found to efficiently catalyze the three-component reaction between different enols, aldehydes, and malononitrile , leading to rapid synthesis of 2-amino-4h-chromene derivatives in fairly high yields. the catalyst is easily prepared, highly stable, simple to handle and recycled for several times without significant loss of activity. the method is simp...

Journal: :iranian journal of catalysis 2015
sayeydmosatfa habibi-khorassani malek taher maghsoodlou mehdi shahraki mohammad ali poorshamsoddin mahsa karima

sucrose is applied as an efficient catalyst for the three-component reaction consisting of aromatic aldehydes, malononitrile and resorcinol in a mixture of water and ethanol media as green solvents. the advantages of this method are excellent yeild, inexpensive catalyst and more environmentally friendly. mechanistic insight into the synthesis of 2-amino-4h-chromene included spectral kinetics ap...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2011
ghodsi mohammadi ziarani alireza badiei masoomeh azizi peshman zarabadi

3,4-ِdihydropyrano[c]chromene derivatives were synthesized using sulfonic acid functionalized silica (sio2-pr-so3h) as a highly efficient heterogenous solid acid catalyst via one-pot three-component condensation of aromatic aldehydes with malononitrile and 4-hydroxycoumarin in excellent yields.

Journal: :Organic & biomolecular chemistry 2011
Vijay Nair C R Sinu R Rejithamol K C Seetha Lakshmi Eringathodi Suresh

An unexpected transformation of 2H-chromene-3-carboxaldehydes to coumarin derivatives, mediated by NHC, is reported.

2016
Lígia R. Gomes John Nicolson Low André Fonseca Maria João Matos Fernanda Borges

Three coumarin derivatives, viz. 6-methyl-N-(3-methyl-phen-yl)-2-oxo-2H-chromene-3-carboxamide, C18H15NO3 (1), N-(3-meth-oxy-phen-yl)-6-methyl-2-oxo-2H-chromene-3-carboxamide, C18H15NO4 (2), and 6-meth-oxy-N-(3-meth-oxy-phen-yl)-2-oxo-2H-chromene-3-carboxamide, C18H15NO5 (3), were synthesized and structurally characterized. The mol-ecules display intra-molecular N-H⋯O and weak C-H⋯O hydrogen bo...

Journal: :Ibn Al-Haitham Journal For Pure And Applied Science 2023

Chromene is considered a fused pyran ring with benzene ring, which found in many plants and part of important compounds such as anthocyanidins, anthocyanins, catechins, flavanones. These are included under the headings "flavonoids" "iso-flavonoids." well known bioactive molecules wide medicinal uses. According to these pharmacokinetic characteristics, researchers giving more attention this type...

Journal: :Organic & biomolecular chemistry 2011
Marta Costa Filipe Areias Marian Castro Jose Brea María I Loza Fernanda Proença

A one-pot procedure was developed for the synthesis of novel 3-[amino(methoxy)methylene]-2-oxo-3,4-dihydro-2H-chromen-4-yl)-3-cyanoacetamides and chromeno[3,4-c]pyridine-1-carbonitriles from the reaction of 2-oxo-2H-chromene-3-carbonitriles and cyanoacetamides. These chromene derivatives were identified as new scaffolds for adenosine receptors and the hits 3a, 3c, 5a, and 5b were found.

2016
Srinivas Thadkapally Athira C Kunjachan Rajeev S Menon

The cesium carbonate-mediated reaction of 2-bromoallyl sulfones and ortho-hydroxychalcones furnished 3-arylsulfonyl-4H-chromene derivatives in 58-67% yield (18 examples). 2-Bromoallyl sulfones functioned as synthetic surrogates for allenyl sulfones in the reaction.

2014
SARA HALLAJIAN ESKANDAR ALIPOUR NASER FOROUGHIFAR MOHAMMAD A. KHALILZADEH

The reaction of dimethyl acetylenedicarboxylate with OH-acid such as 2-naphthol in the presence of trimethyl or triphenyl phosphite under solvent-free conditions produce oxaphosphaphenanthrene derivatives in good yields. Also, the reaction of dimethyl acetylenedicarboxylate and trimethyl phosphite in the presence of 1-naphthol leads to succinate derivatives in excellent yields. Using triethyl p...

Journal: :Organic & biomolecular chemistry 2010
Jian-Wu Xie Li-Ping Fan Hong Su Xin-Sheng Li Dong-Cheng Xu

Efficient kinetic resolution of racemic 3-nitro-2H-chromenes by bifunctional thiourea afforded optically active (R)-3-nitro-2H-chromene derivatives with moderate to good enantioselectivities, which simultaneously gave the multifunctional 3,4-diphenyl-3a-nitrobenzopyrano-[3,4-c]-pyrrolidine-1,1-dicarboxylate derivatives with four vicinal chiral carbon centers.

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