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
A general, efficient, and experimentally simple method for the generation of sulfenate salts has been developed using β-sulfinylesters as substrates. The process is based on a retro-Michael reaction, initiated by deprotonation at low temperature. Upon treatment with alkyl halides, the liberated sulfenates are subsequently converted into sulfoxides in good to excellent yield. Extension of the methodology
Diastereoselective Access to anti-β-Hydroxy Sulfoxides from Chiral Epoxides and Prochiral Sulfenate Anions: Mechanistic Insights, Scope, and Limitation
作者:Ken Ohmori、Jian Zhang、Vipul V. Betkekar、Keisuke Suzuki
DOI:10.1055/a-2196-5592
日期:——
route to anti-β-hydroxy sulfoxides through the reaction of epoxides with sulfenate anions. Extensive experimental/computationalstudies revealed the dual special roles of MgBr2·OEt2, serving to generate the bromohydrin alkoxide intermediate, which undergoes nucleophilic attack on the prochiral sulfenate in a diastereoselective manner. The present study has opened a general stereoselective synthetic