Robust Acenaphthoimidazolylidene Palladacycles: Highly Efficient Catalysts for the Amination of N-Heteroaryl Chlorides
作者:Qinyue Deng、Yang Zhang、Haibo Zhu、Tao Tu
DOI:10.1002/asia.201700877
日期:2017.9.19
A series of robust N‐heterocyclic carbene palladacycles have been successfully developed. These showed high catalytic activity and selectivity toward the challenging amination of N‐heteroaryl chlorides. Different primary and secondary amines were fully compatible with this catalytic system. Remarkably, no double amination products could be detected when primary amines were utilized in our catalytic
Cu-Catalyzed Aerobic Oxidative Cyclizations of 3-<i>N</i>-Hydroxyamino-1,2-propadienes with Alcohols, Thiols, and Amines To Form α-<i>O</i>-,<i>S</i>-, and<i>N</i>-Substituted 4-Methylquinoline Derivatives
作者:Pankaj Sharma、Rai-Shung Liu
DOI:10.1002/chem.201406317
日期:2015.3.16
one‐pot, two‐step synthesis of α‐O‐, S‐, and N‐substituted4‐methylquinoline derivatives through Cu‐catalyzed aerobic oxidations of N‐hydroxyaminoallenes with alcohols, thiols, and amines is described. This reaction sequence involves an initial oxidation of N‐hydroxyaminoallenes with NuH (Nu=OH, OR, NHR, and SR) to form 3‐substituted 2‐en‐1‐ones, followed by Brønsted acid catalyzed intramolecular cyclizations
描述了通过醇,硫醇和胺与铜催化的N-羟基氨基丙烯的好氧氧化反应,一锅,两步合成α- O-,S-和N-取代的4-甲基喹啉衍生物。该反应顺序涉及N的初始氧化与NuH(Nu = OH,OR,NHR和SR)形成的γ-羟基氨基丙烯形成3个取代的2 en 1 -1,然后由Brønsted酸催化所得产物的分子内环化。我们的机理分析表明,反应是通过自由基类型的机理进行的,而不是通过典型的硝酮中间体途径进行的。这种新的铜催化反应的实用性通过其对几种2-氨基-4-甲基喹啉衍生物的合成的适用性得到了证明,已知这些衍生物是几种生物活性分子的关键前体。
Base-controlled chemoselectivity reaction of vinylanilines with isothiocyanates for synthesis of quinolino-2-thione and 2-aminoquinoline derivatives
作者:Xi Zhang、Tong-Lin Wang、Cong-De Huo、Xi-Cun Wang、Zheng-Jun Quan
DOI:10.1039/c8cc00062j
日期:——
Here, we report a base-controlled chemo-selective reaction of vinylanilines with alkyl/aryl isothiocyanates to afford quinolino-2-thione and 2-aminoquinoline derivatives. The quinolino-2-thiones could be obtained in high yields in the presence of Et3N. Particularly interesting is that the reaction could produce the 2-aminoquinolines in the presence of K3PO4 with high selectivity.
在这里,我们报告乙烯基苯胺与烷基/芳基异硫氰酸酯的碱控制化学选择性反应,以提供喹啉基-2-硫酮和2-氨基喹啉衍生物。在Et 3 N存在下,可以高产率获得喹啉-2--2-硫酮。特别有趣的是,在K 3 PO 4存在下,该反应可以产生2-氨基喹啉,具有高选择性。
Synthesis of Quinolines and 2‐Functionalized Quinolines by Difluorocarbene Incorporation
作者:Ben‐Jie Jiang、Song‐Lin Zhang
DOI:10.1002/adsc.202200263
日期:2022.7.5
2-SeH quinolines. In the presence of a second nucleophile such as anilines, competing nucleophilic addition of anilines to the selenoisocyanate is preferred, generating selenourea intermediate. Further nucleophilic addition of the ortho-alkenyl to selenourea followed by elimination of H2Se produces 2-aminoquinolines. This allows one-step multi-component modular preparation of various C2-functionalized
开发了一种通用方法,以允许在二氟卡宾前体存在下从邻-烯基苯胺从头构建喹啉和 C2 官能化喹啉。该方法利用伯苯胺与二氟卡宾缩合原位生成异氰化物的关键反应性。随后通过相邻的烯基α-加成异氰化物构建喹啉环。此外,当存在二氟卡宾前体和硒的组合时,通过邻位亲核加成,初步生成硒代异氰酸酯中间体。-烯基产生 2-SeH 喹啉。在第二亲核试剂如苯胺的存在下,苯胺与硒代异氰酸酯的竞争性亲核加成是优选的,生成硒脲中间体。邻位-烯基进一步亲核加成到硒脲,然后消除 H 2 Se 产生 2-氨基喹啉。这允许从容易获得的起始化合物一步多组分模块化制备各种 C2 官能化喹啉。该方法显示出良好的产率、范围和化学选择性。它操作方便且友好,无需处理令人不快的异氰化物。可利用二氟卡宾使伯胺转化为异氰化物来开发其他有趣的反应。
Katayanagi, Yakugaku Zasshi/Journal of the Pharmaceutical Society of Japan, 1949, vol. 69, p. 137,140