Results 71 to 80 of about 17,659,431 (225)

3-(4-Methoxybenzoyl)-6-nitrocoumarin

Acta Crystallographica Section E, 2013
In the title coumarin derivative (also known as 2H-chromen-2-one or 2H-1-benzopyran-2-one), C17H11NO6, the coumarin ring system is nearly planar, with a dihedral angle of 3.35 (9)° between the pyrone and the benzene rings.
Lourdes Santana, Eugenio Uriarte, Saleta Vazquez-Rodriguez   +2 more
doaj   +1 more source

Photo-Cycloaddition Reactions of 2-Pyrones [PDF]

Bulletin of the Chemical Society of Japan, 1990
Abstract Sensitized photoreactions of two 2-pyrones with five unsaturated compounds were investigated. The reactions of 2-pyrones with electron-deficient ethylenes gave [4+2]cycloadducts (3) and [2+2]cycloadducts (4) across the C5–C6 double bonds in the 2-pyrones.
Kenichi Somekawa, Tetsuro Shimo, Hiroyuki Yoshimura, Takaaki Suishu   +3 more
openaire   +1 more source

Unlocking the Quality Potential of Liberoid Coffee: Advances in Composition, Processing, and Microbial Fermentation

Comprehensive Reviews in Food Science and Food Safety, Volume 25, Issue 3, May 2026.
ABSTRACT Liberoid coffee (Coffea liberica group), comprising varieties of Liberica and Excelsa coffee types, is gaining attention for its unique chemical composition and sensory potential. However, its quality remains under‐optimized due to limited understanding of genotype‐specific traits and processing responses.
Noor Ariefandie Febrianto, Fan Zhu
wiley   +1 more source

14-Ethoxy-4,6-dimethyl-9-phenyl-8,12-dioxa-4,6-diazatetracyclo[8.8.0.02,7.013,18]octadeca-2(7),13,15,17-tetraene-3,5,11-trione

Acta Crystallographica Section E, 2013
In the title compound, C23H20N2O6, the fused pyrone and pyran rings each adopt a sofa conformation. The dihedral angle between the mean planes of the pyran and phenyl rings is 61.9 (1)°.
S. Aravindhan, M. Bakthadoss, D. Kannan, G. Jagadeesan   +3 more
doaj   +1 more source

Breaking Down Barriers: CorA Effectively Targets Staphylococcal Biofilms in Vitro and in Vivo

ChemMedChem, Volume 21, Issue 7, 14 April 2026.
Corallopyronin A (CorA), a natural alpha‐pyrone antibiotic, penetrates Staphylococcus aureus biofilms and inhibits RNA polymerase. This work demonstrates CorA's superior efficacy compared to rifampicin and dalbavancin in reducing viable loads in biofilms both in vitro and in vivo. Graphic created in https://BioRender.com.
Stefania De Benedetti, Nikolay Krasimirov Kirilov, Haoxuan Zeng, Carolin Ade, Isabel Bodenstein, Maximilian Förster, Noran Abdel‐Wadood, Ahmad Aljohmani, Gabriela Krasteva‐Christ, Daniela Yildiz, Sabryna Junker, Syeda Javariya Khalid, Katharina Rox, Hedda Schrey, Miriam Große, Andrea Schiefer, Sören Leif Becker, Kenneth Pfarr, Achim Hoerauf, Markus Bischoff, Mathias Müsken, Tanja Schneider   +21 more
wiley   +1 more source

Catalytic Asymmetric Diels-alder Reactions of 2-pyrone Derivatives

, 1994
Cycloaddition reactions between the chiral 2-pyrone derivatives 9 and various dienophiles, catalysed by lanthanide shift reagents, afforded diastereomerically pure bicyclic lactones 3.
Evans, GR., István E Markó, Declercq, Jean-Paul, Jean-Paul Declercq, Marko, Istvan, Graham R Evans   +5 more
core   +1 more source

3,3′-[(1E,1′E)-Hydrazine-1,2-diylidenebis(ethan-1-yl-1-ylidene)]bis(4-hydroxy-6-methyl-2H-pyran-2-one)

IUCrData, 2019
The title compound, C16H16N2O6, lies about an inversion centre at the mid-point of the N—N bond. The molecule features two intramolecular O—H...N and two C—H...O hydrogen bonds, each of which forms an S(6) ring motif. In the crystal, molecules are linked
Abouelhaoul El Alami, Sdassi Hamid, Abdellatif El Kihel, Mohamed Saadi, Lahcen El Ammari   +4 more
doaj   +1 more source

Antimicrobial Effect of Spices and Their Phytochemicals: A Novel Approach to Overcoming Antibiotic Resistance

MedComm, Volume 7, Issue 4, April 2026.
This graphical abstract shows the antibacterial potential of phytochemicals from 15 spices, showcasing key compounds, their extraction methods, and mechanisms of action. It highlights membrane disruption, ROS generation, enzyme inhibition, and biofilm prevention as core antibacterial pathways.
Hettiyahandi Binodh De Silva, Yanqi Dai, Shervanthi Homer‐Vanniasinkam, Mohan Edirisinghe   +3 more
wiley   +1 more source

Aloenin B, a New Diglucosylated 6-Phenyl-2-pyrone from Kenya Aloe

, 1986
A new 6-phenyl-2-pyrone O,O-diglucoside, aloenin B, was isolated from commercial Kenya aloe. Its structure, 6- {2-O-β-D-[2-O-(E)-p-coumaroyl} glucopyranosyl-4-O-β-D-giucopyranosyl-6-methyl } phenyl-2-pyrone (1), was established by spectral methods and ...
L. LUNAZZI, P. GRAMATICA, P. MANITTO, G. SPERANZA, G. DADA   +4 more
core   +1 more source

Bioactive Phytochemical Compounds in Medicago sativa L. (Alfalfa): A Systematic Review of Biological Properties and Therapeutic Relevance in Nutraceutical and Functional Food Implications

Food Frontiers, Volume 7, Issue 2, March 2026.
ABSTRACT Medicago sativa L. (alfalfa) harbors a remarkably diverse reservoir of bioactive secondary metabolites. Flavonoids, isoflavones, and triterpenoid saponins dominate its bioactivity landscape, driving potent antioxidant, anti‐inflammatory, antimicrobial, estrogenic, hypolipidemic, and cytotoxic actions through redox modulation, membrane ...
Parham Joolaei Ahranjani, Hamid Rashidi Nodeh, Zahra Esfandiari, Giovanna Ferrentino   +3 more
wiley   +1 more source