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.
Palladium-catalyzed Suzuki–Miyaura cross-coupling reaction of potassium 2-pyridyl trifluoroborate with aryl (heteroaryl) halides
Palladium-catalyzed Suzuki–Miyaura cross-couplingreaction of potassium pyridine-2-trifluoroborates and various aryl (heteroaryl) halides can generate the corresponding desired coupling products with moderate to good yields. It can be carried out under the conditions with ethanol as solvent, Pd(OAc)2 and SPhos as catalyst system and Na2CO3 as a base.
吡啶-2-三氟硼酸钾与各种芳基(杂芳基)卤化物的钯催化的Suzuki-Miyaura交叉偶联反应可以产生相应的所需偶联产物,产率中等至良好。可以在以下条件下进行:乙醇为溶剂,Pd(OAc)2和SPhos为催化剂体系,Na 2 CO 3为碱。