Modulating Reactivity and Diverting Selectivity in Palladium-Catalyzed Heteroaromatic Direct Arylation Through the Use of a Chloride Activating/Blocking Group
作者:Benoît Liégault、Ivan Petrov、Serge I. Gorelsky、Keith Fagnou
DOI:10.1021/jo902515z
日期:2010.2.19
Through the introduction of an aryl chloride substituent, the selectivity of palladium-catalyzeddirectarylation may be diverted to provide alternative regioisomeric products in high yields. In cases where low reactivity is typically observed, the presence of the carbon−chlorine bond can serve to enhance reactivity and provide superior outcomes. From a strategic perspective, the C−Cl bond is easily
Visible light-driven C–H arylation of heteroarenes with aryl diazonium salts in water catalyzed by a Z-scheme CuInS<sub>2</sub>/K-C<sub>3</sub>N<sub>4</sub> heterojunction
and synthesized. The structure and composition of CuInS2/K-C3N4 were well characterized. The arylation of heteroarenes with aryldiazoniumsalts driven by a heterogeneous CuInS2/K-C3N4 catalytic system was established under visible light irradiation in water for the first time. A variety of arylated heteroarenes were synthesized in high yields with commendable functional group tolerance. The designed
设计并合成了CuInS 2量子点修饰的KC 3 N 4 Z型异质结。CuInS 2 /KC 3 N 4的结构和组成得到了很好的表征。首次在水中可见光照射下建立了多相CuInS 2 /KC 3 N 4催化体系驱动的杂芳烃与芳基重氮盐的芳基化反应。以高产率合成了多种芳基化杂芳烃,并具有值得称赞的官能团耐受性。设计的CuInS 2 /KC 3 N 4光催化剂可以多次回收和重复使用,而不会显着降低其催化活性。
Bis(imino)acenaphthene (BIAN)-Supported <i>N</i>-Heterocyclic Carbene Palladium Complexes with Ancillary Ligands: Readily Activated Precatalysts for Direct C–H Arylation of Thiophenes
作者:Di-Zhong Zheng、Dong-Hui Li、Huan Liu、Youxiang Shao、Zhuofeng Ke、Feng-Shou Liu
DOI:10.1021/acs.organomet.2c00007
日期:2022.4.25
thiophenes with (hetero)aryl bromides by bulky bis(imino)acenaphthene (BIAN)-supported N-heterocyclic carbene palladiumcomplexes. The relationship between the structure of palladiumcomplexes with ancillary ligands and catalytic properties was discussed. Upon a low palladium loading of 0.01–0.05 mol %, the bulky palladiumcomplex was successfully used to catalyze the cross-coupling of a variety of thiophens