Reductive cross-coupling of aryl halides with ubiquitous alkyl tosylates was developed using a combination of nickel and vitamin B12 catalysts. The tosylate was activated by reduced vitamin B12 to form alkyl cobalt(III) which served as a good alkylating agent for aryl-nickel species, leading to the C(sp3)–C(sp2) bond formation.
Nickel/Cobalt-Catalyzed C(sp<sup>3</sup>)–C(sp<sup>3</sup>) Cross-Coupling of Alkyl Halides with Alkyl Tosylates
作者:Kimihiro Komeyama、Takuya Michiyuki、Itaru Osaka
DOI:10.1021/acscatal.9b03352
日期:2019.10.4
The C(sp3)–C(sp3) cross-coupling of alkyl halides with alkyl tosylates has been developed by employing a combination of nickel and nucleophilic cobalt catalysts in the presence of a manganese reductant. This method provides a straightforward route to a diverse set of not only secondary–primary but also primary–primary C(sp3)–C(sp3) linkages under mild conditions without using alkyl-metallic reagents
PROCESS FOR THE PREPARATION OF SUVOREXANT AND INTERMEDIATES USEFUL IN THE SYNTHESIS OF SUVOREXANT
申请人:DR. REDDY'S LABORATORIES LIMTED
公开号:US20160168138A1
公开(公告)日:2016-06-16
A novel processes for the preparation of suvorexant (formula I), its related compounds and its intermediates that are simple, economical and commercially viable. (I)
Gold N‐Heterocyclic Carbene Catalysts for the Hydrofluorination of Alkynes Using Hydrofluoric Acid: Reaction Scope, Mechanistic Studies and the Tracking of Elusive Intermediates
作者:Raphaël Gauthier、Nikolaos V. Tzouras、Ziyun Zhang、Sandrine Bédard、Marina Saab、Laura Falivene、Kristof Van Hecke、Luigi Cavallo、Steven P. Nolan、Jean‐François Paquin
DOI:10.1002/chem.202103886
日期:2022.1.19
Unconventional fluorination: The development of the chemoselective gold-catalysed hydrofluorination of terminal alkynes using aqueous HF and an easily accessible N-heterocyclic carbene-gold pre-catalyst is reported. Following the observation and isolation of unprecedented organometallic intermediates and computational studies, a catalytic cycle is proposed, featuring an in situ generation of the chemoselective