primary amines under the standard conditions, the bis(N‐phenyl) products were predominantly formed. This method was also applicable to the synthesis of bioactive N‐phenyl amino acid derivatives. The control experiments, the deuterium labelling study, and the presence of regioisomers of N‐arylated products when using 4‐substituted triarylsulfonium triflates suggested that the reaction might proceed through
本文介绍了一种简单有效的三芳基ulf三氟甲磺酸酯对各种胺进行无过渡金属N-芳基化的方法。在t BuOK或KOH存在下,脂族和芳族胺均在80°C下平稳转化,从而以高至高收率获得了相应的单N芳基化产物。反应物的摩尔比和碱的选择对反应有很大的影响。当在标准条件下将大量过量的[Ph 3 S] [OTf]和t BuOK用于伯胺时,主要形成了双(N-苯基)产物。该方法也适用于生物活性氮的合成-苯基氨基酸衍生物。对照实验,氘标记研究以及使用4-取代的三芳基ulf三氟甲磺酸酯时N芳基化产物的区域异构体的存在表明,该反应可能会通过芳烃中间体进行。本方案证明,三芳基ulf盐在C Ar -N键的构建中是通用的芳基化试剂。
<i>o</i>-Iodoxybenzoic Acid Mediated<i>N</i>-Arylation of Aromatic Amines by Using Arylhydrazines as the Arylating Counterpart
作者:Ravindra R. Jadhav、Sameerana N. Huddar、Krishnacharya G. Akamanchi
DOI:10.1002/ejoc.201300917
日期:2013.10
the combination of arylhydrazines with o-iodoxybenzoicacid (IBX) for the generation of aryl free radicals. On the basis of this finding, a method was developed for the N-arylation of aromaticamines under mild conditions (base-free, –5 °C) by usingarylhydrazines as the arylatingcounterpart and arylamines. The scope of this method was demonstrated by using a number of arylhydrazines and arylamines,
Mediator-Enabled Electrocatalysis with Ligandless Copper for Anaerobic Chan–Lam Coupling Reactions
作者:Benjamin R. Walker、Shuhei Manabe、Andrew T. Brusoe、Christo S. Sevov
DOI:10.1021/jacs.1c02103
日期:2021.4.28
chemical oxidants with electrochemistry for a variety of metal-catalyzed processes, electrooxidative reactions with ligandless coppercatalysts are plagued by slow electron-transfer kinetics, irreversible copper plating, and competitive substrate oxidation. Herein, we report the implementation of substoichiometric quantities of redox mediators to address limitations to Cu-catalyzed electrosynthesis. Mechanistic
简单的铜盐可作为催化剂,在合成中一些最常用的转化中实现 C-X 键形成反应,包括芳基硼酸和胺的氧化偶联。然而,这些 Chan-Lam 偶联反应历来依赖于化学氧化剂,这限制了它们在小规模合成之外的适用性。尽管在各种金属催化过程中成功地用电化学取代了强化学氧化剂,但无配体铜催化剂的电氧化反应仍受到电子转移动力学缓慢、不可逆镀铜和竞争性基材氧化的困扰。在此,我们报告了亚化学计量氧化还原介体的实施,以解决铜催化电合成的局限性。机理研究表明,介体通过以下方式发挥多种作用:(i) 快速氧化低价 Cu 中间体,(ii) 从阴极剥离 Cu 金属以再生催化剂并揭示用于质子还原的活性 Pt 表面,以及 (iii) 提供阳极过充电保护,防止基材氧化。该策略适用于在没有化学氧化剂的情况下芳基胺、杂芳基胺和烷基胺与芳基硼酸的 Chan-Lam 偶联。与空气中的传统反应相比,这些电化学条件下的偶联具有更高的产率和更短的反应时间,并提供互补的底物反应性。
PROSTACYCLIN RECEPTOR AGONIST
申请人:Medshine Discovery Inc.
公开号:EP3750879A1
公开(公告)日:2020-12-16
A compound represented by formula (I) or an isomer or a pharmaceutically acceptable salt thereof. The present invention also relates to an application of the same in preparing a drug for treating a disease related to a PGI2 receptor.
has been applied in the coupling reactions of anilines for the synthesis of diarylamines and azobenzenes. The copper complex that is formed in situ plays a double duty by harnessing photon energy as a photocatalyst and then by catalysing organometallic elementary steps as a transition metal catalyst. By the selection of hydrazones and bases, the reaction selectivity of aniline can be tuned between homo-coupling