Photoredox Nickel-Catalyzed C–S Cross-Coupling: Mechanism, Kinetics, and Generalization
作者:Yangzhong Qin、Rui Sun、Nikolas P. Gianoulis、Daniel G. Nocera
DOI:10.1021/jacs.0c11937
日期:2021.2.3
self-sustained productive Ni(I/III) cycle leading to a quantum yield Φ > 1; (ii) found that pyridinium iodide, formed in situ, serves as the dominant quencher for the excited state photocatalyst and a critical redox mediator to facilitate the formation of the active Ni(I) catalyst; and (iii) observed critical intermediates and determined the rate constants associated with their reactivity. Not only do the findings
A Well-Defined (POCOP)Rh Catalyst for the Coupling of Aryl Halides with Thiols
作者:Samuel D. Timpa、Christopher J. Pell、Oleg V. Ozerov
DOI:10.1021/ja505576g
日期:2014.10.22
been shown to favor aryl thiolate reductive elimination at elevated temperatures and in some cases at room temperature, compared with the analogous diarylamido/bis(phosphine) (PNP)Rh pincer system. Concerted reductive elimination has been studied with 6a directly and in the presence of aryl bromide and aryl chloride traps. This investigation demonstrates a clear rate dependence on aryl chloride concentration
Nickel-Catalyzed C−S Bond Formation via Decarbonylative Thioetherification of Esters, Amides and Intramolecular Recombination Fragment Coupling of Thioesters
A nickelcatalyzed cross‐coupling protocol for the straightforward C−Sbond formation has been developed. Various mercaptans and a wide range of ester and amide substrates bearing various substituents were tolerated in this process which afforded products in good to excellent yields. Furthermore, an intramolecular protocol for the synthesis of thioethers starting from thioesters has been developed
INHIBITION OF P38 KINASE ACTIVITY USING SUBSTITUTED HETEROCYCLIC UREAS
申请人:Dumas Jacques
公开号:US20120046290A1
公开(公告)日:2012-02-23
This invention relates to the use of a group of aryl ureas in treating cytokine mediated diseases, other than cancer and proteolytic enzyme mediated diseases, other than cancer, and pharmaceutical compositions for use in such therapy.
Copper-catalyzed Ullmann coupling under ligand- and additive-free conditions. Part 2: S-Arylation of thiols with aryl iodides
作者:Pongchart Buranaprasertsuk、Joyce Wei Wei Chang、Warinthorn Chavasiri、Philip Wai Hong Chan
DOI:10.1016/j.tetlet.2008.01.060
日期:2008.3
S-Arylation of a wide variety of substituted aryl and aliphatic thiols with aryl halides catalyzed by copper iodide under mild ligand- and additive-free conditions (nBu4NBr, PhMe, NaOH, reflux, 22 h) is accomplished in good to excellent product yields (up to 96%).
在温和的无配体和无添加剂条件下(n Bu 4 NBr,PhMe,NaOH,回流,22 h),将各种取代的芳基和脂肪族硫醇与碘化铜催化的芳基卤化物进行S-芳基化反应产品收率(高达96%)。