Results 1 to 10 of about 126 (70)

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

Molecules, 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, Nagaraju Kerru, Sreekantha Babu Jonnalagadda   +2 more
doaj   +1 more source

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

Heliyon, 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, Mohammad R. Naimi-Jamal, Leila Panahi, Mohammad G. Dekamin, Bahareh Farasati Far   +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

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

BMC 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, Bi Bi Fatemeh Mirjalili, Elaheh Babaei, Abdolhamid Bamoniri   +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

Iodine-Catalyzed Prins Cyclization of Homoallylic Alcohols and Aldehydes

Molecules, 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, Erick L. Bastos, Antônio C. Doriguetto, Kachi R. Kishore Kumar Reddy, Iara M. L. Rosa   +4 more
doaj   +1 more source

EFFECT OF PYROLYSIS HEATING RATE ON THE CHEMICAL COMPOSITION OF WOOD VINEGAR FROM EUCALYPTUS UROGRANDIS AND MIMOSA TENUIFLORA [PDF]

Revista Árvore, 2020
Among the parameters used in the biomass carbonization process, the heating rate is one of the most important. The objective of the present work was to assess the influence of different heating rates on the chemical composition of wood vinegar (WV) from ...
Lúcio César Dantas de Medeiros, Alexandre Santos Pimenta, Renata Martins Braga, Tatiane Kelly de Azevedo Carnaval, Pedro Nico Medeiros Neto, Dulce Maria de Araújo Melo   +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

Populene D Analogues: Design, Concise Synthesis and Antiproliferative Activity

Molecules, 2012
An efficient and concise synthesis of nine populene D analogues was performed using an iodine-catalyzed Prins cyclization as the key transformation.
Kachi R. Kishore Kumar Reddy, Giovanna B. Longato, João E. de Carvalho, Ana L. T. G. Ruiz, Luiz F. Silva, Jr.   +4 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