4-bromophenyl MIDA boronate;1-(4-Bromophenyl)-5-methyl-2,8-dioxa-5-azonia-1-boranuidabicyclo[3.3.0]octane-3,7-dione;1-(4-bromophenyl)-5-methyl-2,8-dioxa-5-azonia-1-boranuidabicyclo[3.3.0]octane-3,7-dione
Radical C−N Borylation of Aromatic Amines Enabled by a Pyrylium Reagent
作者:Yuanhong Ma、Yue Pang、Sonia Chabbra、Edward J. Reijerse、Alexander Schnegg、Jan Niski、Markus Leutzsch、Josep Cornella
DOI:10.1002/chem.202000412
日期:2020.3.23
Herein, we report a radical borylation of aromatic amines through a homolytic C(sp 2 )-N bond cleavage. This method capitalizes on a simple and mild activation via a pyrylium reagent ( Sc Pyry-OTf) thus priming the amino group for reactivity. The combination of terpyridine and a diboron reagent triggers a radical reaction which cleaves the C(sp 2 )-N bond and forges a new C(sp 2 )-B bond. The unique
Scalable, Metal- and Additive-Free, Photoinduced Borylation of Haloarenes and Quaternary Arylammonium Salts
作者:Adelphe M. Mfuh、John D. Doyle、Bhuwan Chhetri、Hadi D. Arman、Oleg V. Larionov
DOI:10.1021/jacs.6b01376
日期:2016.3.9
We report herein a simple, metal- and additive-free, photoinduced borylation of haloarenes, including electron-rich fluoroarenes, as well as arylammoniumsalts directly to boronic acids. This borylation method has a broad scope and functional group tolerance. We show that it can be further extended to boronic esters and carried out on gram scale as well as under flow conditions.
Direct introduction of a naphthalene-1,8-diamino boryl [B(dan)] group by a Pd-catalysed selective boryl transfer reaction
作者:Liang Xu、Pengfei Li
DOI:10.1039/c5cc00231a
日期:——
reagent, B(pin)-B(dan), has been utilised in the Pd-catalysed borylation of aryl bromides and chlorides. Remarkably selective formation of aryl-B(dan) bonds is established. This represents a direct and efficient way to introduce masked boronic acids. The synthetic usefulness of this reaction is demonstrated in the preparation of boron-differentiated di- and polyboron compounds.
Suzuki reaction of aryl bromides and arylboronicacids is developed. The cross-coupling reactions can be performed at room temperature using 5.0 equiv. of Et3N as solvent and base without any ligands, and affording biaryl products in good yields. In addition, the chemoselecitive Suzuki reaction of bromo-N-methyliminodiacetic acid (MIDA) boronates with arylboronicacids can be achieved in this system, and
A modular synthesis of functionalised phenols enabled by controlled boron speciation
作者:John J. Molloy、Robert P. Law、James W. B. Fyfe、Ciaran P. Seath、David J. Hirst、Allan J. B. Watson
DOI:10.1039/c5ob00078e
日期:——
two boronic acid derivatives has been developed via one-pot Suzuki–Miyaura cross-coupling, chemoselective control of boron solution speciation to generate a reactive boronic ester in situ, and oxidation. The utility of this method has been further demonstrated by application in the synthesis of drug molecules and components of organic electronics, as well as within iterativecross-coupling.