Photosubstitution-photoreduction mechanistic duality in the SET photoreactions of nitrophenyl ethers with amines. The role of the steps that follow the ET
作者:Miquel Mir、Jordi Marquet、Oriol Massot
DOI:10.1016/s0040-4020(99)00735-8
日期:1999.10
photoreduced by primary amines in water through a mechanism initiated by single electron transfer that is in direct competition with the single electron transfer photosubstitution mechanism (SNAr∗-SET). Our results indicate that the preferred pathway does not depend on the electron donor or proton donor ability of the amine. The key factor that determines the progress of the photoreaction is the structure
Pyrimidine Derivatives Which Are Antagonists Of Vitronectin Receptor
申请人:Lefrancois Jean-Michel
公开号:US20080058348A1
公开(公告)日:2008-03-06
A subject of the invention is the compounds of formula (I);
in which R
1
, R
2
, R
3
, R
4
and R have the meanings indicated in the description, their preparation process, their use as medicaments having an antagonist activity on the vitronectin receptor and the pharmaceutical compositions containing them.
Titania-Supported Gold Nanoparticles Catalyze the Selective Oxidation of Amines into Nitroso Compounds in the Presence of Hydrogen Peroxide
作者:Stella Fountoulaki、Petros L. Gkizis、Theodoros S. Symeonidis、Eleni Kaminioti、Athanasia Karina、Ioannis Tamiolakis、Gerasimos S. Armatas、Ioannis N. Lykakis
DOI:10.1002/adsc.201500957
日期:2016.4.28
titania‐supported gold nanoparticles (Au/TiO2) was studied for the selectiveoxidation of amines into nitroso compounds using hydrogen peroxide (H2O2). Gold nanoparticles deposited on Degussa P25 polymorphs of titania (TiO2) have been found to promote the selective formation of a variety of nitroso arenes in high yields and selectivities, even in a large‐scale synthesis. In contrast, alkyl amines are
在本文中,研究了用二氧化钛负载的金纳米颗粒(Au / TiO 2)的催化活性,以利用过氧化氢(H 2 O 2)将胺选择性氧化为亚硝基化合物。已经发现,沉积在二氧化钛(TiO 2)的Degussa P25多晶型物上的金纳米颗粒即使在大规模合成中也能以高收率和选择性促进多种亚硝基芳烃的选择性形成。相反,在所检查的条件下,烷基胺被氧化成相应的肟。动力学研究表明,被给电子基团取代的芳基胺的氧化速度快于具有吸电子功能的相应胺。一系列哈密特动力学分析对-X-取代的芳基胺牵连的电子转移(ET)机制(ρ= -1.15),用于与伴随形成相应的氧化反应ñ -芳基羟胺作为可能的中间。我们还表明,在存在1,3-环己二烯的情况下,芳基胺的氧化方案可导致二烯与原位形成的亚硝基芳烃之间相应的杂Diels-Alder加合物的出色收率。
Synthesis of Nitrosobenzene Derivatives via Nitrosodesilylation Reaction
作者:Corinna Kohlmeyer、Maike Klüppel、Gerhard Hilt
DOI:10.1021/acs.joc.8b00262
日期:2018.4.6
of trimethylsilyl-substituted benzene derivatives into nitrosobenzene derivatives is reported. The optimization of the reaction conditions was performed for moderately electron-deficient, electron-rich, and sterically hindered starting materials by varying reaction time, temperature, and equivalents of NOBF4. Also, a stable intermediate of the nitrosation reaction could be characterized by 19F NMR which
报道了三甲基甲硅烷基取代的苯衍生物的亲电子ipso-取代成亚硝基苯衍生物。通过改变反应时间,温度和NOBF 4的当量,对中度电子不足,电子富集和空间受阻的原料进行了反应条件的优化。而且,亚硝化反应的稳定中间体可以通过19 F NMR表征,该19 F NMR可以与亚硝基苯衍生物分配给NO +加成物。该配合物在水后处理中分解并释放出所需的亚硝基苯衍生物。
Piperazines as P2X7 antagonists
申请人:Betschmann Patrick
公开号:US20080076924A1
公开(公告)日:2008-03-27
Novel compounds of Formula (I) or pharmaceutically acceptable salts thereof, metabolites thereof, isomers thereof, enantiomers thereof or prodrugs thereof of Formula (I)
wherein the substituents are as defined herein, which are useful as therapeutic agents.