established for the preparation of phenothiazines in good yields by two routes, starting from 2-iodoanilines and 2-bromobenzenethiol and from aryl ortho-dihalides and o-aminobenzenethiols, by conducting the reaction at 90 °C in poly(ethylene glycol)-100 (PEG-100). In addition, the catalyst system was useful for promoting direct arylation of various aryl amines, aliphatic amines, and aqueous ammonia. The simple
Tungsten‐Catalyzed Direct
<i>N</i>
‐Alkylation of Anilines with Alcohols
作者:Xiao‐Bing Lan、Zongren Ye、Chenhui Yang、Weikang Li、Jiahao Liu、Ming Huang、Yan Liu、Zhuofeng Ke
DOI:10.1002/cssc.202002830
日期:2021.2.5
tungsten‐catalyzed N‐alkylation reaction of anilines with primary alcohols via BH/HA. This phosphine‐free W(phen)(CO)4 (phen=1,10‐phenthroline) system was demonstrated as a practical and easily accessible in‐situ catalysis for a broad range of amines and alcohols (up to 49 examples, including 16 previously undisclosed products). Notably, this tungsten system can tolerate numerous functional groups,
Mimicking transition metals in borrowing hydrogen from alcohols
作者:Ananya Banik、Jasimuddin Ahmed、Swagata Sil、Swadhin K. Mandal
DOI:10.1039/d1sc01681d
日期:——
Borrowinghydrogen from alcohols, storing it on a catalyst and subsequent transfer of the hydrogen from the catalyst to an in situ generated imine is the hallmark of a transition metal mediated catalytic N-alkylation of amines. However, such a borrowinghydrogen mechanism with a transition metal free catalytic system which stores hydrogen molecules in the catalyst backbone is yet to be established
从醇中借用氢气,将其储存在催化剂上,然后将氢气从催化剂转移到原位生成的亚胺,这是过渡金属介导的胺催化N-烷基化的标志。然而,这种在催化剂主链中储存氢分子的无过渡金属催化系统的借氢机制尚未建立。在此,我们证明苯酚基配体可以模仿过渡金属在储存和转移氢分子中的作用,从而导致借氢介导的醇类苯胺烷基化,包括广泛的底物范围。通过各种光谱技术、氘标记实验和 DFT 研究表征几种中间体,对机制途径进行了仔细检查,得出的结论是,基于苯酚基的主链通过脱芳构化过程依次添加 H + 、 H˙ 和一个电子,随后将其用作还原剂。相当于催化方式中的C-N双键。
A Highly Active PN<sup>3</sup> Manganese Pincer Complex Performing N-Alkylation of Amines under Mild Conditions
作者:Leonard Homberg、Alexander Roller、Kai C. Hultzsch
DOI:10.1021/acs.orglett.9b00832
日期:2019.5.3
on a nonsymmetric PN3-ligand scaffold for the N-alkylation of amines with alcohols utilizing the borrowing hydrogen methodology is reported. A broad range of anilines and the more challenging aliphatic amines were alkylated with primary and secondary alcohols. Moreover, the combination of low catalyst loadings and mild reaction conditions provides high efficiency for this atom-economic transformation
4-Substituted Quinoline Derivatives, Method and Intermediates for Their Preparation and Pharmaceutical Compositions Containing Them
申请人:Tabart Michel
公开号:US20080032985A1
公开(公告)日:2008-02-07
The present invention relates to 4-substituted quinoline derivatives of general formula I:
which are active as antimicrobials. The invention also relates to the method and intermediates for their preparation and the pharmaceutical compositions containing them.