Results 31 to 40 of about 35,228 (210)

Dearomative [4 + 2] Annulation of Electron-Poor N‑Heteroarenes with Azoalkenes for Access to Polycyclic Tetrahydro-1,2,4-triazines

, 2023
A direct dearomative [4 + 2] annulation of electron-poor N-heteroarenes with azoalkenes generated in situ from α-halogeno hydrazones was developed under mild conditions.
Yu-Qing Guan, Dong-Chao Wang (1863811), Hai-Ming Guo (1395550), Jia-Hui Liu (1841488), Jia-Hui Liu, Yu-Qing Guan (5810885), Dong-Chao Wang, Hai-Ming Guo   +7 more
core   +1 more source

Hydrophilic Sulfonated Bis-1,2,4-Triazine Ligands Are Highly Effective Reagents for Separating Actinides(III) from Lanthanides(III) via Selective Formation of Aqueous Actinide Complexes [PDF]

, 2015
We report the first examples of hydrophilic 6,6’-bis(1,2,4-triazin-3-yl)-2,2’-bipyridine (BTBP) and 2,9-bis(1,2,4-triazin-3-yl)-1,10-phenanthroline (BTPhen) ligands, and their applications as actinide(III) selective aqueous complexing agents.
Harwood, Laurence, Lewis, Frank W., Geist, Andreas, Distler, Petr, Kozhevnikov, Valery, Kozhevnikov, Valery N., Lewis, Frank, Hudson, Michael, Harwood, Laurence M., John, Jan, Hudson, Michael J.   +10 more
core   +1 more source

Ring Cleavage of Some Bicylic Compounds Derived from 1,2,4-Triazine [PDF]

Iranian Journal of Chemistry & Chemical Engineering, 1995
Ring cleavage occurred when 1,2,4-triazino-1,2,4-triazines (3), (4) and (5) were treated with concentrated hydrochloric acid to yield N-substituted triazines (7) and (8). These confirm the given configuration assigned to the isomeric triazinotriazines. 6-
Majid M. Heravi, Mehdi Bakavoli, Zohreh Sadjadi Hashemi   +2 more
doaj  

Arylation of 1,2,4-triazines in the presence of AlCl3 [PDF]

, 2014
This paper presents a method for introducing toluene and bromobenzene moieties into 1,2,4-triazines as an alternative to cross-coupling reactions. It is demonstrated that the C=N bond of a wide range of 1,2,4-triazines undergoes addition of arenes in the
Egorov, I. N.
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Synthesis and Photophysical Properties of α-(N-Biphenyl)-Substituted 2,2′-Bipyridine-Based Push–Pull Fluorophores

Molecules, 2022
A series of new α-(N-biphenyl)-substituted 2,2′-bipyridines were obtained through the combination of the ipso-nucleophilic aromatic substitution of the C5-cyano group, aza-Diels–Alder and Suzuki cross-coupling reactions, starting from 5-cyano-1,2,4 ...
Ekaterina S. Starnovskaya, Dmitry S. Kopchuk, Albert F. Khasanov, Olga S. Taniya, Igor L. Nikonov, Maria I. Valieva, Dmitry E. Pavlyuk, Alexander S. Novikov, Grigory V. Zyryanov, Oleg N. Chupakhin   +9 more
doaj   +1 more source

Discovery of Potent and Fast-Acting Antimalarial Bis-1,2,4-triazines

, 2021
Novel 3,3′-disubstituted-5,5′-bi(1,2,4-triazine) compounds with potent in vitro activity against Plasmodium falciparum parasites were recently discovered.
Beveridge, Julia G, Priebbenow, Daniel L, Brand, Stephen, Wang, Wen, Edstein, Michael D, Avery, Vicky M, Duffy, Sandra, Shi, Da-Hua, Zhong, Longjin, Harjani, Jitendra R, Chavchich, Marina, Jacobs, Robert T, et al., Mathiew, Mitch, Shackleford, David M   +14 more
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The separation of americium(III) from europium(III) by two new 6,6'-bistriazinyl-2,2'-bipyridines in different diluents [PDF]

, 2011
The synthesis and extraction of americium(III) and europium(III) from aqueous nitric acid solutions by the new BTBP ligands 6,6’-bis(5,5,7,7- tetramethyl-5,7-dihydrofuro[3,4-e]-1,2,4-triazin-3-yl)-2,2’-bipyridine (Cy5-O-Me4-BTBP), and 6,6’-bis(5,5,7,7 ...
Petr Distler, Lewis, Frank, Lewis, Frank W., Harwood, Laurence, Distler, Petr, Hudson, Michael, Michael J. Hudson, Harwood, Laurence M., Jan John, Hudson, Michael J., John, Jan, Laurence M. Harwood, Frank W. Lewis   +12 more
core   +1 more source

A Regioselective Approach to 5-Substituted-3-amino-1,2,4-triazines

, 2016
Nucleophilic displacement of readily available α,α-dibromoketones with excess morpholine gave the corresponding ketoaminals, which upon condensation with aminoguanidine in MeOH in the presence of AcOH afforded 5-substituted-3-amino-1,2,4-triazines in >95%
Paul N. Devine (1831207), Robert A. Reamer (1433476), John Limanto (1433470), Richard A. Desmond (2454514), Donald R. Gauthier (1633033), R. P. Volante (2664142)   +5 more
core   +1 more source

One-Pot Acid-Catalyzed Ring-Opening/Cyclization/Oxidation of Aziridines with N‑Tosylhydrazones: Access to 1,2,4-Triazines

, 2017
A new, three-step, telescoped reaction sequence for the regioselective conversion of N-tosyl hydrazones and aziridines to 3,6-disubstituted and 3,5,6-trisubstituted 1,2,4-triazines is described. The process involves an efficient nucleophilic ring opening
Lorène Crespin (3748822), David C. Blakemore (465247), Lorenzo Biancalana (2572165), Tobias Morack (3748825), Steven V. Ley (532034)   +4 more
core   +1 more source

A Direct Route to 6,6’-Disubstituted-2,2’-Bipyridines by Double Diels-Alder/retro Diels-Alder Reaction of 5,5’-bi-1,2,4-Triazines

Molecules, 2005
Inverse electron demand Diels-Alder reaction of functionalized 5,5’-bi-1,2,4- triazines with bicyclo[2.2.1]hepta-2,5-diene in boiling p-cymene leads to a range of 6,6’- disubstituted-2,2’-bipyridines in good yield.
D. Branowska
doaj   +1 more source