Ir(III)-Catalyzed Mono-Olefination of Aryl C–H Bonds Using −SCF<sub>3</sub> as a Weak Directing Group
作者:Rui-Peng Bao、Xian Chen、Chen Li、Dong-Hui Wang
DOI:10.1021/acs.orglett.9b03125
日期:2019.10.4
The trifluoromethylthionyl group (-SCF3) is an efficient weak directing group for Ir(III)-catalyzed aryl C-H olefination. Various trifluoromethylthioethers provide high levels of mono-olefination products in good to excellent yields under mild conditions with a 2,2'-bipyridine ligand or AgBF4 as an additive. Mechanistic studies indicate the C-H cleavage is the rate-determining step. The directing group ability of the -SCF3 group is benchmarked against several other weak directing groups by competition experiments under Ir(III)-catalyzed conditions.
Ruthenium-Catalyzed Oxidative C–H Bond Olefination of <i>N</i>-Methoxybenzamides Using an Oxidizing Directing Group
作者:Bin Li、Jianfeng Ma、Nuancheng Wang、Huiliang Feng、Shansheng Xu、Baiquan Wang
DOI:10.1021/ol2032575
日期:2012.2.3
Ruthenium-catalyzed oxidative C-H bond olefination of N-methoxybenzamides using an oxidizing directing group with a broad substrate scope is reported. The reactions of N-methoxybenzamides with acrylates in MeOH and styrene (or norbornadiene) in CF3CH2OH afforded two types of products.