Palladium-Catalyzed γ-C(sp<sup>3</sup>
)−H Arylation of Thiols by a Detachable Protecting/Directing Group
作者:Likun Jin、Jianchun Wang、Guangbin Dong
DOI:10.1002/anie.201807760
日期:2018.9.17
Reported herein is a palladium‐catalyzed, directed γ‐C(sp3)−Harylation of protected thiols. The key is to utilize Michael acceptors as a dual reagent to install a protecting/directing group on thiols by a thiol‐Michael click reaction, and remove it later under basic conditions. The C−H arylation proceeds with high functional‐group tolerance and the deprotected thiols can be further transformed into
Herein, we describe a mild and efficient two-step procedure to introduce a thiol group on aromatic substrates. First, reaction with an activated sulfoxide leads to an arylsulfonium salt intermediate. Then, two successive beta-elimination-based dealkylation reactions afford the desired arylthiols in good to excellent yields.