A highly efficient palladium‐catalyzed disilylation reaction of arylhalides through C−H activation has been developed for the first time. The reaction has broad substrate scope. A variety of arylhalides can be disilylated by three types of C−H activation, including C(sp2)−H, C(sp3)−H, and remote C−H activation. In particular, the reactions are also unusually efficient. The yields are essentially
for the synthesis of fluorene and its derivatives starting from 2-iodobiphenyls and CH2Br2. A range of fluorene derivatives can be synthesized under relatively mild conditions. The reaction proceeds via a tandem palladium-catalyzed dual C–C bond formation sequence through the key dibenzopalladacyclopentadiene intermediates, which are obtained from 2-iodobiphenyls through palladium-catalyzed C–H activation
Palladium/Norbornene Chemistry: Synthesis of Norbornene-Containing Arylsilanes Involving Double C–Si Bond Formation
作者:Yankun Xu、Xiaodong Liu、Wenqi Chen、Guobo Deng、Yun Liang、Yuan Yang
DOI:10.1021/acs.joc.8b02282
日期:2018.11.16
A novel palladium-catalyzed three-component cascade reaction of arylhalides with norbornene and hexamethyldisilane has been described, which allows the simultaneous construction of two C–Si bonds and one C–C bond. The method achieves ortho C–H functionalization of arylhalidesthrough the formation of the five-membered palladacycle, leading to norbornene-containing arylsilanes.
Palladium-catalyzed C–H bond activation for the assembly of <i>N</i>-aryl carbazoles with aromatic amines as nitrogen sources
作者:Xiaobing Liu、Heyun Sheng、Yao Zhou、Qiuling Song
DOI:10.1039/c9cc09493h
日期:——
A convenient and efficient palladium-catalyzedC-Hbondactivation for the assembly of N-aryl carbazole is reported, in which two C-N bonds were formed under one set of conditions. The desired carbazoles were achieved in decent yields with a wide substrate scope by utilizing readily available 2-iodo biphenyls and aromatic amines as starting materials.
diaziridinone under palladium catalysis. A wide range of carbazoles were synthesized in good to excellent yields, and indolederivatives were obtained by using styrenes as the substrate. The palladacycles obtained from 2‐iodobiphenyls acted as the key intermediate, and the reaction should proceed via a tandem Pd‐catalyzedC−Hactivation/dual C−N bond formation sequence.