Results 1 to 10 of about 3,431 (233)

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

open access: yesHeliyon, 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   +4 more
doaj   +2 more sources

Zr-MOF-glutaraldehyde-Adn@Fe3O4 nanocomposite: as a new adsorbent for removal of methylene blue and heterogeneous nanocatalyst for the synthesis of tetrahydrobenzo[b]pyran derivatives [PDF]

open access: yesScientific Reports
In this research, a magnetic hybrid material (Zr-MOF-glutaraldehyde-Adn@Fe3O4) consisting of UiO-66-NH2 as a stable and unique metal-organic framework, and Fe3O4 nanoparticles was synthesized.
Fatemeh Yazdiamiri   +3 more
doaj   +2 more sources

Metal-organic framework catalysed multicomponent reactions towards the synthesis of Pyrans [PDF]

open access: yesHeliyon
Metal-Organic Frameworks (MOFs) gaining increasing interest in heterogeneous catalysis owing to their advantageous properties such as superior porosity, high surface area, ample catalytic sites.
Subrahmanya Ishwar Bhat, Chinmay Bhat
doaj   +2 more sources

Facile Assembly of Structurally Diverse 2H-Pyrans Enabled by Chloropalladation-Initiated Carboetherification of Alkenes [PDF]

open access: yesMolecules
3,6-Dihydro-2H-pyran heterocyclic framework is one of the currently developed heterocyclic building blocks in both pharmaceutical chemistry and organic synthesis, but with significant challenges.
Fanghua Mao   +5 more
doaj   +2 more sources

Entry to new spiroheterocycles via tandem Rh(II)-catalyzed O–H insertion/base-promoted cyclization involving diazoarylidene succinimides [PDF]

open access: yesBeilstein Journal of Organic Chemistry
A facile approach to novel medicinally relevant spiro heterocyclic scaffolds (namely furan-2(5H)-ones, tetrahydrofurans and pyrans spiro-conjugated with the succinimide ring) has been developed.
Alexander Yanovich   +4 more
doaj   +2 more sources

Recent Progress in the Multicomponent Synthesis of Pyran Derivatives by Sustainable Catalysts under Green Conditions

open access: yesMolecules, 2022
Pyrans are one of the most significant skeletons of oxygen-containing heterocyclic molecules, which exhibit a broad spectrum of medicinal applications and are constituents of diverse natural product analogues.
Suresh Maddila   +2 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]

open access: yesشیمی 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   +2 more
doaj   +1 more source

Nano-SiO2/DBN: an efficacious and reusable catalyst for one-pot synthesis of tetrahydrobenzo[b]pyran derivatives

open access: yesBMC Chemistry, 2021
Background The nano-sized particles enhance the exposed surface area of the active part of the catalyst, thereby increasing the contact between precursors and catalyst considerably. In this study, nano-SiO2/1,5-diazabicyclo[4.3.0]non-5-en was synthesized,
Maryam Mehravar   +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

open access: yesCurrent 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   +4 more
doaj   +1 more source

Iodine-Catalyzed Prins Cyclization of Homoallylic Alcohols and Aldehydes

open access: yesMolecules, 2013
The iodine-catalyzed Prins cyclization of homoallylic alcohols and aldehydes was investigated under metal-free conditions and without additives. Anhydrous conditions and inert atmosphere are not required.
Luiz F. Silva   +4 more
doaj   +1 more source

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