Results 101 to 110 of about 3,742 (239)

The intramolecular capture of thermally generated merocyanine dyes derived from naphthopyrans: Photochromism of 5-(diarylhydroxymethyl)-2H-naphtho[1,2-b]pyrans

, 2012
A series of 2H-naphtho[1,2-b]pyrans bearing a diarylmethanol unit at C-5 have been synthesised by the addition of an excess of an aryllithium reagent to alkyl 2H-naphtho[1,2-b]pyran-5-carboxylate precursors.
Kolla, Suresh B., Gibbons, Lucy V., Gabbutt, Christopher D., Heron, B. Mark   +3 more
core   +3 more sources

Palladium(II)-Catalyzed Intramolecular 1,4-Oxyacyloxylation of Conjugated Dienes. A Stereocontrolled Route to Fused Six-Membered Lactones and Pyrans

, 2016
Stereocontrolled palladium(II)-catalyzed intramolecular 1,4-oxidations of dienyl acids and alcohols proceed under mild conditions to give fused δ-lactones and pyrans, respectively, in good yields.
B. Anders Persson (2718820), Jan-E. Bäckvall (2466835), Renzo C. Verboom (2718817)   +2 more
core   +1 more source

Response Surface Optimization of Ultrasound‐Assisted Deep Eutectic Solvent Extraction of Bioactive Polysaccharides From Sword Bean (Canavalia gladiata (Jacq.) DC.) Pods

Chemistry &Biodiversity, Volume 23, Issue 10, October 2026.
The polysaccharide from sword been pods (CGPs‑1) demonstrates potent antioxidant activity through DPPH and ABTS radical scavenging (IC50: 31.18 and 2.264 mg/mL), inhibits key carbohydrate‑hydrolyzing enzymes including α‑amylase and α‑glucosidase (IC50: 0.083 and 0.157 mg/mL), reduces MPTP‐induced neuroinflammation in zebrafish embryos (0.1–0.4 mg/mL ...
Jieyu Xing, Linjing Zhang, Zhaoxuan Liang, Zheng Liu, Haiyun Chen, Xian Fu   +5 more
wiley   +1 more source

Hydroxyl-Directed Ruthenium-Catalyzed C–H Bond Functionalization: Versatile Access to Fluorescent Pyrans

, 2016
Hydroxyl-assisted oxidative annulations of alkynes were accomplished with an inexpensive ruthenium(II) complex, delivering fluorescent pyrans via highly site selective as well as chemo- and regioselective C–H/O–H bond ...
Margherita Donati (2067406), Vedhagiri S. Thirunavukkarasu (1939174), Lutz Ackermann (1392253)   +2 more
core   +1 more source

Polyphenols as Natural Therapeutics for Dental Infections and Oral Inflammation: Mechanisms and Clinical Perspectives

Chemistry &Biodiversity, Volume 23, Issue 10, October 2026.
Polyphenol‐rich plant extracts provide natural immunomodulatory protection for oral health through complementary antioxidant, antibacterial, and anti‐inflammatory actions. Their potential to reduce harmful microbial activity and inflammation highlights the promise of dietary polyphenols as a natural strategy for maintaining oral health and preventing ...
Deepa Subramanian, Divya Krishnamoorthi, Gowtham Kannan, Benedict Mathews Paul   +3 more
wiley   +1 more source

An Ab Initio Molecular Orbital Study of the Conformational Energies of 2-Alkyltetrahydro-2H-Pyrans (Tetrahydropyrans, Oxacyclohexanes, Oxanes)

, 2000
Ab initio Hartree-Fock and Density Functional Theory calculations were used to obtain the geometries and relative energies of the rotamers in the chair conformations of 2-alkyltetrahydro-2H-pyrans and 2- (trimethylsilyl)tetrahydro-2H-pyran. The MP2/6-31G*
Kasner, Marc, Hehre, Warren J., Freeman, Fillmore, Kasner, J. A.   +3 more
core   +1 more source

Botanical, Phytochemistry, Pharmacology and Applications of Genus Heracleum: A Review

Chemistry &Biodiversity, Volume 23, Issue 10, October 2026.
This manuscript presents a comprehensive review of plant species in the genus Heracleum, from botanical classification and distribution to medicinal uses, phytochemistry, pharmacology, and applications, aiming to provide references for further exploration of their therapeutic value and research development.
Nan Zhang, Yuan Li, Zhi‐Yuan Guo, Ye‐Zi Ma, Miao‐Miao Xu, Dong‐Dong Zhang   +5 more
wiley   +1 more source

α-Alkoxystannanes as masked oxonium ions: application to the synthesis of furo[2,3-b]pyrans

, 2006
α-Alkoxystannanes undergo oxidation upon treatment with cerium ammonium nitrate generating oxonium ions, which can be trapped in an intramolecular fashion affording furo[2,3-b]pyrans. © 2006 Elsevier Ltd.
Peter Quayle, Mills, Keith, Wang, Shouming, Gilbert, Philip S., Shouming Wang, Simon P. Thompson, Philip S. Gilbert, Michael R. Attwood, Lewis, Mark L., Thompson, Simon P., Attwood, Michael R., Quayle, Peter, Mark L. Lewis, Keith Mills   +13 more
core   +1 more source

Green MW/US‐Assisted Construction of Pyrano[2,3‐b]pyridines and Pyrazolo[3,4‐d]pyrimidinones: Pathway Control and Antibacterial Evaluation

Chemistry &Biodiversity, Volume 23, Issue 10, October 2026.
A rapid, green MW/US‐assisted route was developed for synthesizing coumarin/azacoumarin‐based fused heterocycles. It enables efficient construction of pyrano[2,3‐b]pyridines and pyrazolo[3,4‐d]pyrimidinones under mild conditions. FT‐IR, NMR, MS, and elemental analysis fully confirmed the structures of the new products.
Sultanah M. Alhunayhin, Ayman M. Algohary, Youssef O. Al‐Ghamdi, Mohamed Abdel‐Megid, Asmaa M. Fahim, Sameh A. Rizk   +5 more
wiley   +1 more source

Dual-site synergistic copper-polyoxoniobate: Ultralow-energy mechanochemical synthesis of bioactive 4H-pyrans

Nano Research
A copper-polyoxoniobate cluster (Cu-PONb) featuring Lewis acid/base dual sites was developed for the ultralow-energy mechanochemical synthesis of pharmacologically relevant 2-amino-3-cyano-4H-pyrans (ACPs).
Jiaqi Qin, Hongrui Tian, Weina Cai, Hui Chen, Zouguang Han, Yanfeng Bi, Baokuan Chen   +6 more
doaj   +1 more source