The synthesis of N-alkyl-1H-1,2,4-triazoles from N,N-dialkylhydrazones and nitriles via formal [3+2] cycloaddition including the C-chlorination/nucleophilic addition/cyclisation/dealkylation sequence was developed. This sequential reaction utilising the in situ generation of hydrazonoyl chloride based on the ambiphilic reactivity of hydrazones afforded a variety of multi-substituted N-alkyl-triazoles
Kinetic studies of hydrazine and 2-hydroxyethylhydrazine alkylation by 2-chloroethanol: Influence of a strong base in the medium
作者:V. Goutelle、V. Pasquet、J. Stephan、A. J. Bougrine、H. Delalu
DOI:10.1002/kin.20409
日期:2009.6
(or dialkylation of N2H4), leading to the formation of two isomers: 1,1‐di(hydroxyethyl)hydrazine and 1,2‐di(hydroxyethyl)hydrazine. In this study, hydrazine and hydroxyalkylhydrazine alkylations followed SN2 reactions triggered directly by CletOH or indirectly in the presence of a strong base by ethylene oxide, an intermediate compound. The kinetics was studied in diluted mediums by quantifying HEH
为了优化收率,在有或没有氢氧化钠的情况下,进行了有关由2-氯乙醇(CletOH)将N 2 H 4烷基化而得到的2-羟乙基肼(HEH)合成反应动力学的研究。在这两种情况下,HEH形成的主要反应是HEH烷基化(或N 2 H 4的二烷基化)的连续平行反应,导致形成两种异构体:1,1-二(羟乙基)肼和1 ,2-二(羟乙基)肼 在这项研究中,肼和羟烷基肼的烷基化反应遵循S N2个反应直接由CletOH引发,或在强碱存在下由环氧乙烷(一种中间化合物)间接引发。通过气相色谱和气相色谱-质谱联用(GC-MS)定量HEH和CletOH,在稀释的介质中研究了动力学。建立了每个反应的活化参数以及培养基中存在的强碱对反应机理的影响。全局数学处理适用于每个替代方法。它允许根据试剂浓度和温度对反应进行建模。在通过CletOH直接烷基化的情况下,模拟建立了半分批和分批合成和在实验对于浓缩的介质(证实的1.0M≤[CletOH]
4-(4-cyano-2-thioaryl)dihydropyrimidinones and their use
申请人:Bayer Intellectual Property GmbH
公开号:US08288402B2
公开(公告)日:2012-10-16
The present invention relates to novel 4-(4-cyano-2-thioaryl)dihydropyrimidin-2-one derivatives, to processes for their preparation, to their use alone or in combination for the treatment and/or prevention of diseases and also to their use for preparing medicaments for the treatment and/or prevention of diseases, in particular for the treatment and/or prevention of disorders of the lung and the cardiovascular system.
4-(4-CYANO-2-THIOARYL)DIHYDROPYRIMIDINONES AND THEIR USE
申请人:Von Nussbaum Franz
公开号:US20110034433A1
公开(公告)日:2011-02-10
The present invention relates to novel 4-(4-cyano-2-thioaryl)dihydropyrimidin-2-one derivatives, to processes for their preparation, to their use alone or in combination for the treatment and/or prevention of diseases and also to their use for preparing medicaments for the treatment and/or prevention of diseases, in particular for the treatment and/or prevention of disorders of the lung and the cardiovascular system.
Reaction of 1,1-disubstituted hydrazines with bromine in the presence of aryl- and heteroarylnitroso compounds in acid media: A general method for the synthesis of 1-aryl(heteroaryl)-3,3-disubstituted triazene 1-oxides
作者:S. G. Zlotin、O. V. Prokshits、N. F. Karpenko、Yu. A. Strelenko、O. A. Luk'yanov
DOI:10.1007/bf00864338
日期:1992.8
We have worked out a method for the synthesis of 1,3,3-trisubstituted triazene 1-oxides based upon reaction of 1,1-disubstituted hydrazines with bromine in the presence of aryl- and heteroarylnitroso compounds in acid media. Obtained are a broad range of triazene 1-oxides, among which hitherto unknown compounds of the series of pyrazole and 3,3-dialkyltriazene 1-oxides that contain functional groups at the alkyl part of the molecule. We propose a reaction scheme which includes in situ formation of diazenium cations and reaction of them with nitroso compounds that are present in the system. By means of PMR, C-13, and N-14 NMR spectroscopy, and mass spectroscopy, it has been shown that in all the prepared compounds the oxidated nitrogen atom is at the N1 position of the triazene N-oxide group.