Ruthenium(II)-Catalyzed sp<sup>3</sup> C–H Bond Arylation of Benzylic Amines Using Aryl Halides
作者:Navid Dastbaravardeh、Michael Schnürch、Marko D. Mihovilovic
DOI:10.1021/ol301680v
日期:2012.7.20
protocol for the directarylation of benzylic amines was developed. Employing 3-substituted pyridines as directing groups, arylation was achieved usingarylbromides or aryl iodides as the aryl source. Potassium pivalate proved to be an important additive in this transformation. The arylation took place selectively in the benzylic sp3 position, and no significant competitive sp2arylation was observed
C(sp<sup>3</sup>)–H Bond Arylations Catalyzed by Well-Defined [Ru(O<sub>2</sub>CMes)<sub>2</sub>(<i>p</i>-cymene)]
作者:N. Y. Phani Kumar、Rajkumar Jeyachandran、Lutz Ackermann
DOI:10.1021/jo400658d
日期:2013.4.19
The well-characterized ruthenium(II) biscarboxylate complex [Ru(O2CMes)2(p-cymene)] enabled versatile direct (hetero)arylations of C(sp3)–H bonds with low (co)catalyst loading and ample substrate scope. Detailed mechanistic studies provided strong support for a facile and reversible C(sp3)–H bond metalation.
Ruthenium(0)-Catalyzed sp<sup>3</sup> C–H Bond Arylation of Benzylic Amines Using Arylboronates
作者:Navid Dastbaravardeh、Michael Schnürch、Marko D. Mihovilovic
DOI:10.1021/ol300627p
日期:2012.4.6
A Ru-catalyzed direct arylation of benzylic sp(3) carbons of acyclic amines with arylboronates is reported. This highly regioselective and efficient transformation can be performed with various combinations of N-(2-pyridyl) substituted benzylamines and arylboronates. Substitution of the pyridine directing group in the 3-position proved to be crucial in order to achieve high arylation yields. Furthermore, the pyridine directing group can be removed in high yields via a two-step protocol.