1006-40-2Relevant articles and documents
Nickel-catalyzed regioselective C-H halogenation of electron-deficient arenes
Li, Ze-Lin,Wu, Peng-Yu,Cai, Chun
, p. 3462 - 3468 (2019)
A straightforward Ni(ii)-catalyzed general strategy was developed for the ortho-halogenation of electron-deficient arenes with easily available halogenating reagents N-halosuccinimides (NXS; X = Br, Cl and I). The transformation was highly regioselective and a wide substrate scope and functional group tolerance were observed. This discovery could be of great significance for the selective halogenation of amides, benzoic esters and other substances with guiding groups. Mechanistic investigations were also described.
Acid-promoted palladium(II)-catalyzed ortho-halogenation of primary benzamides: En route to halo-arenes
Jaiswal, Yogesh,Kumar, Amit
, (2019/08/26)
Br?nsted acid-promoted palladium(II)-catalyzed regioselective installation of halogens (Br, Cl, and I) to the aromatic ring of benzamide derivatives has been achieved using primary amides. A wide variety of benzamides were compatible under established conditions to afford the halogenated products without installing any external auxiliary. Mild reaction conditions, use of primary amide as a directing group, external additive-free conditions, and gram-scale reaction are some appealing features of this protocol. Detailed experimental results revealed that Br?nsted acid plays a critical role in this transformation.