Results 1 to 10 of about 200 (108)

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

BMC Chem, 2021
Abstract 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, characterized and used as a heterogeneous nanocatalyst for the ...
Mehravar M, Mirjalili BBF, Babaei E, Bamoniri A.   +3 more
europepmc   +6 more sources

A novel recyclable hydrolyzed nanomagnetic copolymer catalyst for green, and one-pot synthesis of tetrahydrobenzo[b]pyrans. [PDF]

Sci Rep
Polymer-based catalysts have garnered significant interest for their efficiency, reusability, and compatibility with various synthesis processes. In catalytic applications, polymers offer the advantage of structural versatility, enabling functional groups to be tailored for specific catalytic activities.
Maleki B, Ashrafi SS, Kargar PG, Alipour A, Pahnavar Z, Ebrahimzadeh P.   +5 more
europepmc   +4 more sources

A facile and one-pot synthesis of new tetrahydrobenzo[b]pyrans in water under microwave irradiation. [PDF]

BMC Chem, 2019
AbstractEleven new tetrahydrobenzo[b]pyran derivatives were synthesized via a three component reaction of different aromatic aldehydes, methyl cyanoacetate and 1,3-cyclohexadione, with water as solvent under catalyst-free microwave irradiation. The structures of all the new molecules were well analysed and their structures established by using various ...
Khumalo MR, Maddila SN, Maddila S, Jonnalagadda SB.   +3 more
europepmc   +5 more sources

Novel 5,6,7,8-tetrahydrobenzo[b]pyran Derivatives: Synthesis and Anticancer Activity

Acta Chimica Slovenica, 2023
Many new cyclized pyran systems with a potential anti-cancer activity were designed and prepared. Pyran systems showed high reactivity to various chemical reagents. 24 products of the prepared compounds were chosen and tested in (mM) as respectable anticancer factors.
Amira E M, Abdallah, Rafat M, Mohareb, Maher H E, Helal, Mariam M, Abd Elkader   +3 more
openaire   +2 more sources

Multicomponent Synthesis Strategies, Catalytic Activities, and Potential Therapeutic Applications of Pyranocoumarins: A Comprehensive Review

Chemistry &Biodiversity, Volume 20, Issue 10, October 2023., 2023
Abstract Fused coumarins, because of their remarkable biological and therapeutic properties, particularly pyranocoumarins, have caught the interest of synthetic organic chemists, leading to the development of more efficient and environmentally friendly protocols for synthesizing pyranocoumarin derivatives.
Jayalakshmi M, Francis Joy, Aatika Nizam, Suresh Babu Naidu Krishna   +3 more
wiley   +1 more source

The Green and Efficient One-pot Synthesis of Tetrahydrobenzo[b]pyran Derivatives

Orbital: The Electronic Journal of Chemistry, 2023
Glutamic acid is used as an efficient organocatalyst for one-pot synthesis of tetrahydrobenzo [b]pyran via condensation of an aromatic aldehyde, dimedone and malononitrile in ethanol: water (1:4) as solvent at reflux temperature. The short reaction time, cleaner reaction, and easy workup make this protocol practical and economically attractive.
Bhaskar P. Ankush, Balasaheb V. Shitole, Nana V. Shitole   +2 more
openaire   +2 more sources

Oxidative N‐Heterocyclic Carbene Catalysis

Chemistry – A European Journal, Volume 29, Issue 4, January 18, 2023., 2023
The advances in oxidative N‐heterocyclic carbene (NHC)‐catalysis are reviewed according to the strategies that rely on typical NHC‐bound intermediates, including acyl/imidoyl azolium, α,β‐unsaturated acyl azolium, and azolium peroxide species, as well as NHC‐derived ortho‐quinone methide (o‐QM), aza‐fulvene, and triaza‐diene intermediates, with ...
Carmela De Risi, Arianna Brandolese, Graziano Di Carmine, Daniele Ragno, Alessandro Massi, Olga Bortolini   +5 more
wiley   +1 more source

Tacrine Derivatives in Neurological Disorders: Focus on Molecular Mechanisms and Neurotherapeutic Potential

Oxidative Medicine and Cellular Longevity, Volume 2022, Issue 1, 2022., 2022
Tacrine is a drug used in the treatment of Alzheimer’s disease as a cognitive enhancer and inhibitor of the enzyme acetylcholinesterase (AChE). However, its clinical application has been restricted due to its poor therapeutic efficacy and high prevalence of detrimental effects.
Saikat Mitra, Maniza Muni, Nusrat Jahan Shawon, Rajib Das, Talha Bin Emran, Rohit Sharma, Deepak Chandran, Fahadul Islam, Md. Jamal Hossain, Sher Zaman Safi, Sherouk Hussein Sweilam, Yujie Chen   +11 more
wiley   +1 more source

Chemical novelty facilitates herbivore resistance and biological invasions in some introduced plant species

Ecology and Evolution, Volume 10, Issue 16, Page 8770-8792, August 2020., 2020
Ecological release from herbivory due to chemical novelty is predicted to facilitate biological invasions by plants, but has not been tested on a community scale. We used metabolomics to assess the chemical novelty of invasive plant species at a site in eastern North America.
Brian E. Sedio, John L. Devaney, Jamie Pullen, Geoffrey G. Parker, S. Joseph Wright, John D. Parker   +5 more
wiley   +1 more source

Fructose-catalyzed synthesis of tetrahydrobenzo[b]pyran derivatives: Investigation of kinetics and mechanism [PDF]

Chinese Journal of Catalysis, 2015
Abstract Fructose was used as an efficient catalyst for three-component condensation reactions of aryl aldehydes, malononitrile, and dimedone in a mixture of EtOH and H2O as green solvents. The advantages of this method are a short reaction time, high yields, low cost, easy accesses, and simple work-up.
Sayyedeh Shadfar Pourpanah, Sayyed Mostafa Habibi-Khorassani, Mehdi Shahraki   +2 more
openaire   +1 more source