Heteropolycyclic compounds and their use as metabotropic glutamate receptor antagonists
申请人:——
公开号:US20030055085A1
公开(公告)日:2003-03-20
The present invention provides compounds and pharmaceutical compositions that act as antagonists at metabotropic glutamate receptors, and that are useful for treating neurological diseases and disorders. Methods of preparing the compounds also are disclosed.
C–H arylation reactions through aniline activation catalysed by a PANI-g-C<sub>3</sub>N<sub>4</sub>-TiO<sub>2</sub> composite under visible light in aqueous medium
作者:Liang Wang、Jun Shen、Sen Yang、Wenjie Liu、Qun Chen、Mingyang He
DOI:10.1039/c8gc00012c
日期:——
composite was prepared and found to be efficient for radical C–H arylationreactions. The arylation process involved coupling of in situ generated aryl diazonium salts from aniline with heteroarenes, enol acetates or benzoquinones under visible light in aqueous medium or pure water. A broad range of substrates survived the reaction conditions to provide the desired products in moderate to good yields
制备了聚苯胺(聚苯胺)-gC 3 N 4 -TiO 2复合材料,发现它对自由基CHH芳基化反应有效。芳基化过程涉及在水性介质或纯水中在可见光下将苯胺的原位生成的芳基重氮盐与杂芳烃,烯醇乙酸酯或苯醌结合。各种各样的底物在反应条件下均能幸存,以中等至良好的产率提供所需的产物。还实现了放大(10 mmol)合成。该半导体光催化剂显示出良好的光催化性能和稳定性。循环研究表明,这种复合材料很容易被回收,连续十次运行后,催化活性略有下降。
Molecular Design of Donor-Acceptor-Type Organic Photocatalysts for Metal-free Aromatic C−C Bond Formations under Visible Light
作者:Lei Wang、Jeehye Byun、Run Li、Wei Huang、Kai A. I. Zhang
DOI:10.1002/adsc.201800950
日期:2018.11.16
Metal‐free and photocatalytic radical‐mediated aromatic C−C bond formations offer a promising alternative pathway to the conventional transitionmetal‐catalyzed cross‐coupling reactions. However, the formation of aryl radicals from common precursors such as aryl halides is highly challenging due to their extremely high reductive potential. Here, we report a structural design strategy of donor‐acceptor‐type
无金属和光催化自由基介导的芳族碳键形成为常规过渡金属催化的交叉偶联反应提供了有希望的替代途径。然而,由于它们的极高的还原电势,由常见的前体例如芳基卤化物形成芳基是非常具有挑战性的。在这里,我们报告了供体-受体型有机光催化剂通过芳基卤化物的还原脱卤作用形成可见光驱动的CC键形成的结构设计策略。通过简单的供体-受体部分的杂原子工程,可以将光催化剂的还原电势与SCE进行系统地校正为−2.04 V vs. SCE。分子光催化剂的高还原电位可以将各种芳基卤化物还原为芳基,从而与杂芳烃形成C-C键。
Palladium on charcoal-catalyzed ligand-free Stille coupling
An efficient ligand-freeStille coupling reaction catalyzed by palladium on charcoal was developed. Tetraphenyltin was reacted with a variety of aryl halides including aryl chlorides using LiCl as an additive. The reactions of tributyl organotin compounds with aryl iodides were effectively expedited by the addition of LiF. These reactions efficiently proceeded without a phosphine or arsenic ligand
Redox‐Neutral Vicinal Difunctionalization of Five‐Membered Heteroarenes with Dual Electrophiles
作者:Renhe Li、Guangbin Dong
DOI:10.1002/anie.202110971
日期:2021.12.6
A new reaction mode of palladium/norbornene (Pd/NBE) cooperative catalysis is reported involving the selective coupling of two different carbon-based electrophiles for vicinal double C-H functionalization of five-membered heteroarenes in a site-selective and redox-neutral manner. The key is to use alkynyl bromides as the second electrophile, which allows vicinal difunctionalization of a wide range