β-Arylation of Carboxamides via Iron-Catalyzed C(sp3)–H Bond Activation
摘要:
A 2,2-disubstituted propionamide bearing an 8-aminoquinolinyl group as the amide moiety can be arylated at the beta-methyl position with an organozinc reagent in the presence of an organic oxidant, a catalytic amount of an iron salt, and a biphosphine ligand at 50 degrees C. Various features of selectivity and reactivity suggest the formation of an organometallic intermediate via rate-determining C-H bond cleavage rather than a free-radical-type reaction pathway.
Nickel-catalyzed chelation-assisted direct arylation of unactivated C(sp<sup>3</sup>)–H bonds with aryl halides
作者:Mingliang Li、Jiaxing Dong、Xiaolei Huang、Kaizhi Li、Qian Wu、Feijie Song、Jingsong You
DOI:10.1039/c4cc00716f
日期:——
this work, we have disclosed the nickel-catalyzed unactivated beta-C(sp(3))-H bond arylation of aliphatic acid derivatives with aryl iodides/bromides via bidentate chelation-assistance of an 8-aminoquinoline moiety. These preliminary results indicate the intrinsic catalytic potential of nickel metal for unactivated C(sp(3))-H bond arylation.