Anthranilamide (aam)-substituted diboron: palladium-catalyzed selective B(aam) transfer
作者:Shintaro Kamio、Ikuo Kageyuki、Itaru Osaka、Sayaka Hatano、Manabu Abe、Hiroto Yoshida
DOI:10.1039/c8cc05645e
日期:——
An unsymmetrical diboron bearing an anthranilamide (aam) substituent was synthesized and was converted into arylboranes via Pd-catalyzed selective B(aam) transfer.
Anthranilamide (aam)-substituted arylboranes in direct carbon–carbon bond-forming reactions
作者:Shintaro Kamio、Ikuo Kageyuki、Itaru Osaka、Hiroto Yoshida
DOI:10.1039/c8cc10252j
日期:——
Anthranilamide (aam)-substituted arylboranes, which were reported to serve as masked boranes in the Suzuki–Miyaura coupling, have been found to be directly cross-coupled just by use of an aqueous medium. The excellent stability of 2-pyridyl-B(aam) toward protodeborylation allowed their smooth cross-coupling.
Oxygen-promoted Pd/C-catalyzed Suzuki–Miyaura reaction of potassium aryltrifluoroborates
作者:Chun Liu、Chao Liu、Xin-Min Li、Zhan-Ming Gao、Zi-Lin Jin
DOI:10.1016/j.cclet.2015.12.022
日期:2016.5
Abstract A simple and highly efficient protocol has been developed for the Pd/C-catalyzed ligand-free Suzuki–Miyaura reaction of potassium aryltrifluoroborates. In this catalytic system, the results demonstrate that oxygen plays a positive role in the cross-coupling reaction. In addition, this catalytic system could be successfully applied to synthesize biaryl compounds containing a carbazole moiety and the
The actually direct Suzuki-Miyaura coupling with "protected" R-B(dan) (dan = naphthalene-1,8-diaminato) was demonstrated to smoothly occur without in situ deprotection of the B(dan) moiety. The use of t-BuOK (Ba(OH)(2) in some cases) as a base under anhydrous conditions is the key to the successful cross-coupling, where R B(dan) is readily converted into a transmetalation-active borate-form, regardless of the well-accepted diminished boron-Lewis acidity.