Results 41 to 50 of about 2,785 (181)

Recent Approaches for the Synthesis of Pyridine and Quinoline Cores Present in Natural Products

Advanced Synthesis &Catalysis, Volume 368, Issue 10, 19 May 2026.
An anthology of the most recent methods used to synthesize pyridines and quinolines found in natural products over the last decade. Pyridines, quinolines, and their derivatives represent a class of significant heterocyclic compounds that are prevalent in a multitude of natural products, including alkaloids found in plants, fungi, insects, marine ...
Carl Bowman, Mathieu Frenette, Sylvain Canesi   +2 more
wiley   +1 more source

Regioselective Tele‐Substitution of Aroyl Chlorides via Activation by an Al/P Frustrated Lewis Pair

ChemistryEurope, Volume 4, Issue 5, May 2026.
A tele‐substitution of aroyl chlorides with silyl ketene acetals is enabled by an ortho‐phenylene‐linked Al/P frustrated Lewis pair. Intramolecular aluminum activation polarizes the aroylphosphonium intermediate, promoting regioselective dearomative nucleophilic addition to the aromatic ring.
Hirotaka Okamoto, Yoshihiro Nishimoto, Makoto Yasuda   +2 more
wiley   +1 more source

Microwave Assisted Synthesis of Some New Fused 1,2,4-Triazines Bearing Thiophene Moieties With Expected Pharmacological Activity

Molecules, 2011
Rapid and efficient solvent-free synthesis of 4-amino-3-mercapto-6-[2-(2-thienyl)vinyl]-1,2,4-triazin-5(4H)-one 1 under microwave irradiation is described. Some new fused heterobicyclic nitrogen systems such as 1,2,4-triazino[3,4-b][1,3,4]thiadiazinones,
Mosselhi A. Mosselhi, Mohamed M. Youssef, Hosam A. Saad   +2 more
doaj   +1 more source

Rhenium Complexes as Antimicrobial Agents

Helvetica Chimica Acta, Volume 109, Issue 5, May 2026.
Rhenium complexes are stepping into the fight against superbugs. Our new review explores how these metallic complexes could inspire the next generation of antimicrobial therapies. ABSTRACT The escalating crisis of antimicrobial resistance (AMR) necessitates the exploration of unconventional therapeutic scaffolds.
Fabio Zobi, Gozde Demirci, Marija Rasic
wiley   +1 more source

2-Phenyl-7-(4-pyridylmethylamino)-1,2,4-triazolo[1,5-a][1,3,5]triazin-5(4H)-oneFused heterocyclic systems with s-triazine ring. Part 17. For part 16, see Dolzhenko et al. (2011).

Acta Crystallographica Section E, 2011
In the title compound, C16H13N7O, the 1,2,4-triazolo[1,5-a][1,3,5]triazine heterocyclic system is essentially planar (r.m.s. deviation = 0.0375 Å).
Lip Lin Koh, Wai Keung Chui, Anna V. Dolzhenko, Geok Kheng Tan, Anton V. Dolzhenko   +4 more
doaj   +1 more source

Metal‐Free Covalent Organic Frameworks for Photocatalytic CO2 Reduction

ChemistryEurope, Volume 4, Issue 4, April 2026.
This review presents an environmentally sustainable strategy to address the critical issue of escalating atmospheric CO2 levels. It explores the application of metal‐free covalent organic frameworks in a photocatalytic approach, offering a green and efficient strategy for carbon dioxide reduction and contributing to climate change mitigation.
Supriti Dutta, Akhtar Alam, Pekham Chakrabortty, Pradip Pachfule   +3 more
wiley   +1 more source

Synthesis, Characterization, and BSA-Binding Studies of Novel Sulfonated Zinc-Triazine Complexes

Bioinorganic Chemistry and Applications, 2018
Four Zn(II) complexes containing a pyridyl triazine core (L1 = 3-(2-pyridyl)-5,6-di(2-furyl)-1,2,4-triazine-5′,5″-disulfonic acid disodium salt and L2 = 3-(2-pyridyl)-5,6-diphenyl-1,2,4-triazine-4′,4″-disulfonic acid sodium salt) were synthesized, and ...
Nalin Abeydeera, Inoka C. Perera, Theshini Perera   +2 more
doaj   +1 more source

Efficient Routes to Pyrazolo[3,4-e][1,2,4]triazines and a New Ring System: [1,2,4]Triazino[5,6-d][1,2,3]triazines

Molecules, 2010
Arylhydrazonomalononitriles 1a,b react with phenylhydrazine to yield amidrazones 2a,b that cyclize to give 2-aryl-5-phenylhydrazono-2,5-dihydro-[1,2,4]-triazine-6-carbonitriles 5a,b upon reaction with dimethylformamide dimethylacetal (DMFDMA).
Hamad Mohamed Al-Matar, Khaled Dessouky Khalil, Doa’a Mohamed Al-Dorri, Mohamed Helmy Elnagdi   +3 more
doaj   +1 more source

Copper‐ and Silver‐Catalyzed Reactions of Active Methylene Isocyanides: Facile Access to Highly Substituted Five‐ and Six‐Membered Heterocycles

Chemistry – A European Journal, Volume 32, Issue 13, 1 April 2026.
This review summarizes recent advances in copper‐ and silver‐catalyzed reactions of active methylene isocyanides for the synthesis of highly substituted five‐ and six‐membered heterocycles. Emphasis is placed on [3+n] cycloadditions, annulations, and asymmetric strategies, highlighting current limitations and future opportunities in heterocycle ...
Jimil George, Kyungsoo Oh
wiley   +1 more source

Synthesis of Some New 1,2,4-Triazine and 1,2,5-Oxadiazine Derivatives with Antimicrobial Activity

Heteroatom Chemistry, 2019
1,2,4-Triazine and 1,2,5-oxadiazine derivatives 2–12 were obtained from treated 1,3-oxazolone (1) with phenyl hydrazine or hydroxylamine hydrochloride.
Heba E. Hashem, Ahmed M. Abo-Bakr
doaj   +1 more source