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
A novel sequential difunctionalization reaction of 2-iodobiphenyl has been developed by exploiting the distinct reactivities of a palladacycle and an acyclic arylpalladium species. In this tandem reaction, an in situ formed dibenzopalladacyclopentadiene reacts selectively with an alkyl halide, after which the thus formed acyclic arylpalladium species selectively undergoes a Heck reaction with an alkene
A novel and facile approach for the synthesis of triphenylenes has been developed via palladium-catalyzed coupling of 2-iodobiphenyls and iodobenzenes. The reaction involves dual palladium-catalyzed C–H activations and double palladium-catalyzed C–C bond formations. A range of unsymmetrically functionalized triphenylenes can be synthesized with the reaction. The approach features readily available
Pd-Catalyzed C–H Silylation Reactions with Disilanes
作者:Yanghui Zhang、Bo Zhou、Ailan Lu
DOI:10.1055/s-0037-1610339
日期:2019.4
silylation of C,C- palladacycles. 1 Introduction and Background 2 Allylic C–H Silylation Reaction3 Coordinating-Ligand-Directed C–H Silylation Reaction 4 Disilylation of C (sp 2 ), C (sp 2 ) - Palladacycles That are Generated by C(sp 2 )–Hactivation 5 Disilylation of C (sp 2 ), C (sp3 ) - Palladacycles That are Generated by C(sp3 )–HActivation 6 Disilylation of C , C- Palladacycles That are Generated