Aerobic Photooxidation of Phosphite Esters Using Diorganotelluride Catalysts
摘要:
Diorganotellurides containing bulky aromatic substituents are found to catalyze the photooxidation of phosphite esters using aerobic oxygen as a terminal oxidant. A Hammett plot with substituted triaryl phosphites yielding rho = 2.88 agrees with a nucleophilic oxygen transfer from telluroxide to phosphite.
Lewis acid InBr3-catalyzed arylation of diorgano diselenides and ditellurides with arylboronic acids
作者:Kai Ren、Min Wang、Lei Wang
DOI:10.1039/b914533h
日期:——
A novel Lewis acid InBr3-catalyzed direct cross-coupling reaction of arylboronic acids with diorgano diselenides and ditellurides without any additive has been developed. The reactions generated the corresponding unsymmetrical diorgano monoselenides and monotellurides in good to excellent yields. The method has advantages of broad substrate scope, simple operation, mild reaction conditions and high effectiveness. A possible reaction mechanism was proposed.
Sulfur, selenium and tellurium containing amines act as effective carbonic anhydrase activators
作者:Damiano Tanini、Antonella Capperucci、Claudiu T. Supuran、Andrea Angeli
DOI:10.1016/j.bioorg.2019.03.062
日期:2019.6
A new series of β-aminochalcogenides were designed and synthesized to identify new carbonic anhydrase activator (CAA) agents as novel tools for the management of several neurodegenerative and metabolic disorders which represent a clinical challenge without effective therapies available. Some β-aminoselenides and β-aminotellurides showed effective CA activating effects and a potent antioxidant activity
Alkyltelluro Substitution Improves the Radical-Trapping Capacity of Aromatic Amines
作者:Jia-fei Poon、Jiajie Yan、Vijay P. Singh、Paul J. Gates、Lars Engman
DOI:10.1002/chem.201602377
日期:2016.8.26
The synthesis of a variety of aromatic amines carrying an ortho‐alkyltelluro group is described. The new antioxidants quenched lipidperoxyl radicals much more efficiently than α‐tocopherol and were regenerable by aqueous‐phase N‐acetylcysteine in a two‐phase peroxidation system. The inhibition time for diaryl amine 9 b was four‐fold longer than recorded with α‐tocopherol. Thiol consumption in the aqueous
The efficient and mild copper-catalyzed synthesis of unsymmetrical diorganyl chalcogenides under ligand- and solvent-free conditions is described. The cross-coupling reaction was performed using aryl boric acids and 0.5 equiv. of diorganyl dichalcogenides (Te/Se/S) in the presence of 3 mol % of CuI and 3 equiv. of DMSO, under microwave irradiation. This new protocol allowed the preparation of several
Discovery of new 2, 5-disubstituted 1,3-selenazoles as selective human carbonic anhydrase IX inhibitors with potent anti-tumor activity
作者:Andrea Angeli、Elena Trallori、Marta Ferraroni、Lorenzo Di Cesare Mannelli、Carla Ghelardini、Claudiu T. Supuran
DOI:10.1016/j.ejmech.2018.08.096
日期:2018.9
range, and were evaluated for their effects on cell viability against the human prostate (PC3) and breast (MDA-MB-231) cancer cell lines, showing effective anti-tumoractivity. These selenazoles are interesting leads for the development of new, isoform-selective CA IX inhibitors.