Synthesis of Pentacyclic 13-Azadibenzo[a,de]anthracenes via Anionic Cascade Ring Closure
摘要:
Bromine-lithium exchange using tert-butyllithium at -78 degreesC initiates a cascade process whereby either xanthone derivatives or pentacyclic 13-azadibenzo[a,de]-anthracenes are produced in high yields. The reaction proceeds via a sequential intramolecular trapping of organolithium intermediates.
Facile synthesis of 1,2-thiobenzonitriles <i>via</i> Cu-catalyzed denitrogenative radical coupling reaction
作者:Yao Zhou、Ya Wang、Yixian Lou、Qiuling Song
DOI:10.1039/c9cc05099j
日期:——
A Cu-catalyzed synthesis of 1,2-thiobenzonitriles via oxidative C–N cleavage of 3-aminoindazoles followed by radical coupling with thiols is developed. A diverse array of 1,2-thiobenzonitriles were obtained in good yields with wide substrate scope. Notably, this is the first example of denitrogenative radical coupling with 3-aminoindazoles.
Activation of Aryl Thiocyanates Followed by Aryne Insertion: Access to 1,2-Thiobenzonitriles
作者:Martin Pawliczek、Lennart K. B. Garve、Daniel B. Werz
DOI:10.1021/acs.orglett.5b00494
日期:2015.4.3
Palladium-catalyzed activation of carbon–sulfur bonds allows aryne insertion into arylthiocyanates to generate new C–SAr and C–CN bonds in one step. The readily available starting materials make this method efficient in generating a variety of 1,2-thiobenzonitriles. By choosing an oxygen atmosphere the yields are increased and side reactions are minimized.
Photo- and Cu-Mediated 11C Cyanation of (Hetero)Aryl Thianthrenium Salts
作者:Kevin Cheng、E. William Webb、Gregory D. Bowden、Jay S. Wright、Xia Shao、Melanie S. Sanford、Peter J. H. Scott
DOI:10.1021/acs.orglett.4c00929
日期:2024.4.26
We present a photo- and Cu-mediated 11C cyanation of bench-stable (hetero)aryl thianthrenium salts via an aryl radical addition pathway. The thianthrenium substrates can be readily accessed via C–H functionalization, and the radiocyanation protocol proceeds under mild conditions (<50 °C, 5 min) and can be automated using open-source, readily accessible augmentations to existing radiochemistry equipment
我们提出了通过芳基自由基加成途径对实验室稳定的(杂)芳基噻烯盐进行光和铜介导的11 C 氰化。铊底物可以通过 C-H 官能化轻松获得,放射氰化方案在温和条件下(<50°C,5 分钟)进行,并且可以使用开源、易于访问的现有放射化学设备增强功能实现自动化。