64230-27-9Relevant articles and documents
Stepwise mechanism for the bromination of arenes by a hypervalent iodine reagent
Arrieta, Ana,Cossío, Fernando P.,Granados, Albert,Shafir, Alexandr,Vallribera, Adelina
, p. 2142 - 2150 (2020/03/11)
A mild, metal-free bromination method of arenes has been developed using the combination of bis(trifluoroacetoxy)iodobencene and trimethylsilyl bromide. In situ-formed dibromo(phenyl)-λ3-iodane (PhIBr2) is proposed as the reactive intermediate. This methodology using PIFA/TMSBr has been applied with success to a great number of substrates (25 examples). The treatment of mono-substituted activated arenes led to para-brominated products (2u-z) in excellent 83-96% yields. Density functional theory calculations indicate a stepwise mechanism involving a double bromine addition followed by a type II dyotropic reaction with concomitant re-aromatization of the six-membered ring.
Catalyst and Additive-Free Direct Amidation/Halogenation of Tertiary Arylamines with N-haloimide/amides
Xu, Xiu-Juan,Amuti, Adila,Wusiman, Abudureheman
supporting information, p. 5002 - 5008 (2020/10/06)
An approach has been developed for the amidation (halogenation) of tertiary arylamines by electrophilic activation using N-haloimide/amides. Several control experiments have been performed, and the coupling reaction outcomes indicated that the N-haloimide/amide brings three major functions, including electrophilic activation, aromatic halogenation and nucleophilic nitrogen sources. This cascade reaction features simple manipulation, requires no additional catalyst, oxidant or additives, and is performed under mild conditions. (Figure presented.).
Atom-economical brominations with tribromide complexes in the presence of oxidants
Yubata, Kotaro,Matsubara, Hiroshi
, p. 1001 - 1004 (2019/03/13)
Bromination is an important transformation in organic synthesis, and novel efficient bromination techniques are still required. Herein, we demonstrate atom-economical brominations using (DMI)2HBr3, a novel tribromide complex, with oxidants such as DMSO and Oxone. Using this system, olefinic and aromatic brominations, as well as selective α-monobrominations of ketones proceeded well to afford the desired bromides in good yields. Importantly, in these reactions all of the bromine atoms in this complex are used to brominate.