C-H insertion. By employing chiral diphenylethylene diamine (dpen) as ligands bearing electron-withdrawing arylsulfonyl substituents, the reactions occur with remarkable chemo- and enantioselectivities; the competing Curtius-type rearrangement was largely suppressed. Enantioselective nitreneinsertion to allylic/propargylic C-H bonds was also achieved with remarkable tolerance to the C═C and C≡C bonds
as alkoxy quinolines were halogenated at the C5-position via remote functionalization for the first time. This methodology provides a highly economical route to halogenatedquinolines with excellent functional group tolerance, thus providing a good complement to existing remote functionalization methods of quinolin-8-amide derivatives and broadening the field of remote functionalization. The utility
5-Position-selective C–H trifluoromethylation of 8-aminoquinoline derivatives
作者:Yoichiro Kuninobu、Mitsumi Nishi、Motomu Kanai
DOI:10.1039/c6ob01325b
日期:——
We developed a copper-catalyzed 5-position-selective C–H trifluoromethylation of 8-aminoquinoline derivatives. The reaction proceeded with high functional group tolerance under mild conditions. In the case of quinolines with an amide, carbamate, urea, or sulfonamide group at the 8-position of quinoline moieties, a radical scavenger experiment indicated that the reaction proceeded via a radical pathway
Palladium-Catalyzed Direct C–H Silylation and Germanylation of Benzamides and Carboxamides
作者:Kyalo Stephen Kanyiva、Yoichiro Kuninobu、Motomu Kanai
DOI:10.1021/ol500519y
日期:2014.4.4
A palladium-catalyzed regioselectiveactivation of C(sp2)–H and C(sp3)–H bonds of benzamides and carboxamides, followed by coupling with disilanes to afford organosilanes in moderate to high yields, with the aid of 8-aminoquinoline as a directinggroup, is reported. Catalytic C(sp2)–H germanylation of benzamides also proceeds under the same palladiumcatalysis. The reaction tolerates a wide variety
Remote C−H Activation of Quinolines through Copper-Catalyzed Radical Cross-Coupling
作者:Jun Xu、Chao Shen、Xiaolei Zhu、Pengfei Zhang、Manjaly J. Ajitha、Kuo-Wei Huang、Zhongfu An、Xiaogang Liu
DOI:10.1002/asia.201501407
日期:2016.3.18
through copper‐catalyzed sulfonylation under mild conditions. Our strategy shows high conversion efficiency, a broad substrate scope, and good toleration with different functional groups. Furthermore, our mechanistic investigations suggest that a single‐electron‐transfer process plays a vital role in generating sulfonyl radicals and subsequently initiating C−S cross‐coupling. Importantly, our copper‐catalyzed