Palladium-Catalyzed Trifluoromethylthiolation of Aryl C–H Bonds
作者:Chunfa Xu、Qilong Shen
DOI:10.1021/ol5006533
日期:2014.4.4
A method for monotrifluoromethylthiolation of arenes via palladium-catalyzed directed C–H bond activation was described. The reaction was compatible with a variety of functional groups. Initial mechanistic studies disclosed that the turnover limiting step of the catalytic cycle did not involve C–H activation.
Cp*CoIII-catalyzed directed C–H trifluoromethylthiolation using N-trifluoromethylthiodibenzenesulfonimide as an electrophilic SCF3 source is described.
Ligandless Nickel-Catalyzed <i>Ortho</i>-Selective Directed Trifluoromethylthiolation of Aryl Chlorides and Bromides Using AgSCF<sub>3</sub>
作者:Tin Nguyen、Weiling Chiu、Xinying Wang、Madeleine O. Sattler、Jennifer A. Love
DOI:10.1021/acs.orglett.6b02689
日期:2016.11.4
A mild protocol for Ni-catalyzed trifluoromethylthiolation of aryl chlorides and bromides is described herein. The method utilizes AgSCF3 as an easily accessible nucleophilic trifluoromethylthiolating reagent and does not require any ligands or additives. Ortho-selectivity is achieved using a variety of directing groups such as imines, pyridines, and oxazolines for 24 examples in up to 95% yield.
(Pentamethylcyclopentadienyl)cobalt(III)-Catalyzed Direct Trifluoromethylthiolation of Arenes via C−H Activation
作者:Xu-Ge Liu、Qingjiang Li、Honggen Wang
DOI:10.1002/adsc.201700066
日期:2017.6.6
The direct trifluoromethylthiolation of arenes was realized via (pentamethylcyclopentadienyl)cobalt(III)‐catalyzed C(sp2)‐H activation and coupling with AgSCF3 under the assistance of a directing group. The reaction features redox‐neutrality, mild conditions, broad substrate scope, and good functional group tolerance. Preliminary mechanistic studies have been conducted.
Preparation of Electrophilic Trifluromethylthio Reagents from Nucleophilic Tetramethylammonium Trifluoromethylthiolate
作者:Szabolcs Kovács、Bilguun Bayarmagnai、Lukas J. Goossen
DOI:10.1002/adsc.201601298
日期:2017.1.19
A straightforward synthetic entry to the principal classes of electrophilic trifluoromethylthiolating agents is presented. It draws on inexpensive, shelf‐stable tetramethylammonium trifluoromethylthiolate (Me4N–SCF3) as the SCF3 source in the place of stoichiometric coinage metal‐SCF3 complexes.