Catalytic Enantioselective Oxidation of Bulky Alkyl Aryl Thioethers with H2O2 over Titanium-Salan Catalysts
作者:Konstantin P. Bryliakov、Evgenii P. Talsi
DOI:10.1002/ejoc.201100557
日期:2011.8
procedure for the oxidation of bulky (preferably aryl benzyl substituted) thioethers with hydrogen peroxide in good to high yields and enantioselectivities (up to 98.5 % ee) is reported. The high optical yields are achieved in a tandem stereoconvergent enantioselective oxidation and kinetic resolution process. A reasonable balance between the sulfoxide yield and enantioselectivity could be found by varying
[EN] SMALL MOLECULE ACTIVATORS OF NICOTINAMIDE PHOSPHORIBOSYLTRANSFERASE (NAMPT) AND USES THEREOF<br/>[FR] ACTIVATEURS À PETITES MOLÉCULES DE NICOTINAMIDE PHOSPHORIBOSYLTRANSFÉRASE (NAMPT) ET LEURS UTILISATIONS
申请人:SANFORD BURNHAM PREBYS MEDICAL DISCOVERY INST
公开号:WO2018132372A1
公开(公告)日:2018-07-19
Provided herein are small molecule activators of Nicotinamide Phosphoribosyltransferase (NAMPT), compositions comprising the compounds, and methods of using the compounds and compositions.
Sodium Hypochlorite-promoted Novel Synthesis of Organic Ammonium Tribromides and Application of Phenanthroline Hydrotribromide in Chemoselective Oxidation of Organic Sulfides by Hydrogen Peroxide
作者:Madhudeepa Dey、Rupa R. Dey、Siddhartha S. Dhar
DOI:10.1246/cl.131192
日期:2014.5.5
A novel method of synthesis of organic ammonium tribromides (OATBs) is developed by using an inexpensive and eco-friendly sodium hypochlorite as oxidant for conversion of Br− to Br3−. The OATBs thus prepared include both quaternary ammonium tribromides and N-heterocyclic tribromides. A new addition to the family of OATBs is made in the form of phenanthroline hydrotribromide. The efficacy of this new tribromide as catalyst is ascertained in the oxidative transformation of organic sulfides to their corresponding sulfoxides and sulfones by hydrogen peroxide.
Synthesis of 4-Nitrophenyl Sulfones and Application in the Modified Julia Olefination
作者:Jieping Zhu、Daniela Mirk、Jean-Marie Grassot
DOI:10.1055/s-2006-939682
日期:——
4-Nitrophenyl (NP) sulfones were successfully employed in the modifiedJuliaolefination reaction with carbonyl compds. The olefination reaction proceeds through a sequence of aldol addn., Smiles rearrangement, and elimination. The sulfones are easily prepd. in high yields in a two-step sequence starting from inexpensive com. available para-fluoronitrobenzenes via nucleophilic arom. substitution by
4-硝基苯基 (NP) 砜成功地用于与羰基化合物的改性 Julia 烯化反应。烯化反应通过羟醛加成、Smiles 重排和消除的顺序进行。砜很容易制备。从廉价的 com 开始,以两步顺序高产。可通过亲核芳族获得对氟硝基苯。被硫醇取代,随后被氧化。在标准下。使适应。NP 砜与多种芳烃之间的改良 Julia 反应。醛提供相应的苯乙烯、芪和肉桂酸酯衍生物。产率 ?97% 和良好的立体选择性。提出了机械原理来解释 obsd。结果。[在 SciFinder (R) 上]
Borax-Catalyzed and pH-Controlled Selective Oxidation of Organic Sulfides by H<sub>2</sub>O<sub>2</sub>: An Environmentally Clean Protocol
作者:Sahid Hussain、Saitanya K. Bharadwaj、Ravindra Pandey、Mihir K. Chaudhuri