Reductive acylamination of pyridine N-oxide with ethylenediamine and phenylenediamines
摘要:
Reactions of pyridine N-oxide with ethylenediamine and o- and p-phenylenediamines in the presence of p-toluenesulfonyl chloride in alkaline medium lead to the formation of the corresponding N,N'-bis-(p-tolylsulfonyl)-N,N'-bis(pyridin-2-yl)diamines as a result of reductive acylamination.
An Improved Rapid and Mild Deoxygenation of Amine <i>N</i>
-oxides
作者:Y. B. R. D. Rajesh
DOI:10.1002/jhet.3069
日期:2018.2
selective method for the deoxygenation of a variety of amine N‐oxides has been carried out in the presence of silica gel under mild conditions at room temperature to afford corresponding amines in relatively good yields without purification. The reaction is tolerant of a variety of functional groups such as hydroxyl, ester, acid, carbonyl, and cyano groups, as well as halogens. This method would be of great
Reductive Coupling of Nitroarenes and HCHO for General Synthesis of Functional Ethane-1,2-diamines by a Cobalt Single-Atom Catalyst
作者:Jia-Lu Sun、Huanfeng Jiang、Pierre H. Dixneuf、Min Zhang
DOI:10.1021/jacs.3c04857
日期:2023.8.9
access to N,N′-diarylethane-1,2-diamines remains, to date, a challenge. Here, by developing a bifunctional cobalt single-atom catalyst (CoSA-N/NC), we present a general method for direct synthesis of such compounds via selective reductive coupling of cheap and abundant nitroarenes and formaldehyde, featuring good substrate and functionality compatibility, an easily accessible base metal catalyst with
尽管应用广泛,但迄今为止,选择性和多样化地获取N,N'-二芳基乙烷-1,2-二胺仍然是一个挑战。在这里,通过开发一种双功能钴单原子催化剂(Co SA -N/NC),我们提出了一种通过廉价且丰富的硝基芳烃和甲醛的选择性还原偶联直接合成此类化合物的通用方法,具有良好的底物和功能相容性,一种易于获得的贱金属催化剂,具有出色的可重复使用性以及高步骤效率和原子效率。机理研究表明,N锚定的钴单原子(CoN 4)作为还原过程的催化活性位点,N掺杂的碳载体富集了HCHO,及时捕获了原位形成的羟胺,并在弱电条件下提供了所需的硝酮。碱性条件下,随后硝酮和亚胺的逆电子需求1,3-偶极环加成反应,随后环加合物的加氢脱氧反应提供产物。在这项工作中,催化剂控制的硝基芳烃还原原位产生特定结构单元的概念预计将开发出更有用的化学转化。
Pharmacologically active imidazopyridine compounds
申请人:RBS PHARMA (ROGER BELLON SCHOUM) S.p.A.
公开号:EP0151094A2
公开(公告)日:1985-08-07
New imidazopyridine derivatives are described, having the following formula:
wherein R represents a hydrogen atom, an alkyl radical of 1 to 3 carbon atoms, a methoxy group or a halogen atom,
R1 represents a hydrogen atom, an alkyl radical of 1 to 3 carbon atoms,
n represents an integer of 1 to 10,
X represents a non-toxic pharmaceutically acceptable ion, which possess a skeletal muscle paralysing activity.
Karl-Fischer Reagenz und Verfahren zur Bestimmung von wasser mit Hilfe des Reagenzes.
申请人:MERCK PATENT GmbH
公开号:EP0433642A1
公开(公告)日:1991-06-26
Die Erfindung betrifft ein Verfahren zur Herstellung von Alkylenbis(2-pyridylamin)-Verbindungen durch Umsetzung von 2-Halogenpyridinderivaten mit Alkylendiaminen sowie die Verwendung dieser Verbindungen in einem Karl-Fischer-Reagenz zur Bestimmung von Wasser.