Palladium-Catalyzed sp<sup>2</sup>C−H Arylation of Azoarenes with Arylhydrazines
作者:Mingyang Li、Yong Ye
DOI:10.1002/cctc.201500575
日期:2015.12
is important for new compound synthesis, but usually needs special reagents and harsh conditions. With the aid of an azo directing group, the palladium‐catalyzed ortho‐sp2 C−H bond activation of azoarenes with hydrazines has been explored. In the reaction, the Pd catalyst reacts with azobenzene to form a palladacyclic intermediate, which reacts with a phenyl radical generated from phenylhydrazine under
<i>tert-</i>Butyl Nitrite Mediated Regiospecific Nitration of (<i>E</i>)-Azoarenes through Palladium-Catalyzed Directed CH Activation
作者:Biju Majhi、Debasish Kundu、Sabir Ahammed、Brindaban C. Ranu
DOI:10.1002/chem.201403325
日期:2014.8.4
An efficient protocol for the Pd‐catalyzed regiospecific ortho‐nitration of (E)‐azoarenes has been achieved for the first time using tBuONO as a nitrating agent under atmospheric oxygen. A series of both symmetrical and unsymmetrical azoarenes were nitrated efficiently by this procedure providing excellent chemo‐ and regioselectivity and compatibility with a broad array of functional groups.