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。
<i>Para</i>-Selective Halogenation of Nitrosoarenes with Copper(II) Halides
作者:Angela van der Werf、Nicklas Selander
DOI:10.1021/acs.orglett.5b03198
日期:2015.12.18
The para-selective direct bromination and chlorination of nitrosoarenes with copper(II) bromide and chloride is reported. Under mild reaction conditions, a range of halogenated arylnitroso compounds are obtained in moderate to good yields with high regioselectivity. Additionally, the versatility of the method is demonstrated by the development of a one-pot procedure to obtain the corresponding para-halogenated
A straightforward and efficient method for the preparation of 2-aryl-2H-indazoles from ortho-alkyl substituted azoxybenzenes is presented. The reaction proceeds through base-catalyzed benzyl C–H deprotonation and cyclization to afford 2-aryl-2H-indazoles in good yields. This synthetic strategy can be applied to the construction of several fluorescent and bioactive molecules.
RAF INHIBITOR COMPOUNDS AND METHODS OF USE THEREOF
申请人:Buckmelter Alexandre J.
公开号:US20100063066A1
公开(公告)日:2010-03-11
Compounds of Formulas (I), (IIA) and (IIIA) are useful for inhibiting Raf kinase and for treating disorders mediated thereby. Methods of using compounds of Formulas (I), (IIA) and (IIIA) and stereoisomers and pharmaceutically acceptable salts thereof, for in vitro, in situ, and in vivo diagnosis, prevention or treatment of such disorders in mammalian cells, or associated pathological conditions are disclosed.
transition metals are necessary in the reaction of in situ generated arynes with nitrosoarenes to give substitutedcarbazoles. Depending on the fluoride source and the solvent, either N‐arylated carbazoles or NH‐carbazoles are obtained (see scheme; DME=dimethoxyethane, OTf=trifluoromethanesulfonate). In these cascades a CC and one or two CN bonds are formed. The reactions are easy to conduct and proceed