Kinetic substituent and isotope effects in the acid-catalysed rearrangement of N-phenylhydroxylamines. Are nitrenium lons involved?
作者:George Kohnstam、W. Andrew Petch、D. Lyn H. Williams
DOI:10.1039/p29840000423
日期:——
Acidity–rate profiles have been established for the rearrangement of N-phenylhydroxylamine and its derivatives in aqueous sulphuric acid and also in D2SO4–D2O. The results, particularly the change in the magnitude of the kinetic solvent isotope effect on increasing the acidity, are consistent only with a reaction mechanism involving unimolecular decomposition of the O-protonated species. N-Ethyl substitution
已经建立了酸度-速率曲线,用于N-苯基羟胺及其衍生物在硫酸水溶液中以及在D 2 SO 4 -D 2 O中的重排。结果,特别是动力学溶剂同位素效应的幅度随着增加而变化酸度仅与涉及O-质子化的物质的单分子分解的反应机理一致。N-乙基取代对总反应速率的影响很小,而速率常数却因。用4-Me替换100。取代基的作用反对了氮离子中间体的参与,但是表明该中间体更好地由亚胺结构代表,该芳族环的4位带正电荷。
Hydroxylamine derivatives
申请人:Newron Pharmaceuticals S.p.A.
公开号:EP1541547A1
公开(公告)日:2005-06-15
This invention is related to hydroxylamino derivatives of the following general formula (I)
wherein
n is 0, 1 or 2;
R1 and R2, independently of each other, are H, OH or OCH3;
R3 is H or CH3;
R4 is H, C1-C3 straight or branched alkyl or, together with R3, forms a five to seven-membered carbocyclic ring;
and R5 and R6, independently of each other, are H or C1-C5 straight or branched alkyl
and the pharmaceutically acceptable salts or prodrug thereof, for the preparation of medicaments useful for the prevention, treatment and diagnosis of CNS degenerative disorders related to protein misfolding and/or misaggregation.
The invention also relates to novel compounds included in formula (I), to a method for preparing said compounds and to pharmaceutical compositions containing them.
Compounds of structure (I): having antibacterial activity are disclosed, including stereoisomers, pharmaceutically acceptable salts and prodrugs thereof, wherein Q1, Q2, Q3, R8 and R9 are as defined herein. Methods associated with preparation and use of such compounds, as well as pharmaceutical compositions comprising such compounds, are also disclosed.
Die N-Alkyl-N-aryl-hydroxylamine liessen sich zu den Nitronen aliphatischer Aldehyde dehydrieren, die auch durch direkte Kondensation von Aldehyd und Arylhydroxylamin gewonnen werden konnten.
N-烷基-N-芳基-羟胺可被脱水成脂族醛的硝酮,这也可通过醛与芳基羟胺的直接缩合获得。
Hetero-cope-umlagerungen -II. Einfache und flexible synthesen für 2-substituierte indole
作者:Siegfried Blechert
DOI:10.1016/s0040-4039(01)90006-1
日期:1984.1
The reaction of N-phenylhydroxylamine derivatives with electron withdrawing allenes gives o-alkylated anilines, which can further react to form 1,2-disubstituted indoles. 2-Substituted indoles are directly obtainable from reaction with N-phenyl-nitrones.