Ligand-less palladium-catalyzed direct 5-arylation of thiophenes at low catalyst loadings
作者:Julien Roger、Franc Požgan、Henri Doucet
DOI:10.1039/b819912d
日期:——
Ligand-less Pd(OAc)2 provides a very efficient catalyst for the direct5-arylation of thiophenederivatives. With this catalyst, a low palladium concentration (0.1–0.001 mol%) should be employed in order to obtain high yields of coupling products. At higher concentrations a fast formation of inactive “Pd black” generally occurs. Substrates/catalysts ratios up to 100000 can be employed with the most
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