过渡金属催化的未活化芳基CH键与碘代芳烃的直接芳基化已成为构建联芳基的重要方法。通常,直接芳基化反应在化学计量的Ag添加剂的存在下进行;优选地,在室温下进行。此外,如果在底物中存在两个相同的芳族CH键,则通常不可避免地存在二芳基化产物。在这里,我们公开了一种有效的Pd(OAc)2 /三氟乙酸/ O 2催化体系,该体系在无银条件下促进各种芳族CH键与各种碘代芳烃的直接芳基化反应。偶联反应具有完全的单芳基化选择性。这种方法为联芳烃提供了一种简单,便捷且经济的途径。
The catalytic reaction of ketoximes with aryliodides via a Beckmann rearrangement in the presence of a catalytic amount of Pd(OAc)2, Ag2O and ZnBr2 gave substituted phenanthridines in good to excellent yield. In the reaction, aromatic ketoximes converted first to acetanilides in the presence of ZnBr2/TFA via a Beckmann rearrangement followed by arylation in the presence of palladium complex. Furthermore
Ruthenium-catalyzed ortho-arylation of acetanilides with aromatic boronic acids: an easy route to prepare phenanthridines and carbazoles
作者:Ravi Kiran Chinnagolla、Masilamani Jeganmohan
DOI:10.1039/c3cc49398a
日期:——
A regioselective ruthenium-catalyzed ortho-arylation of acetanilides with aromatic boronic acids is described. Later, ortho-arylated acetanilides were converted into phenanthridine and carbazole derivatives.
<i>O</i>-Acetyl Oximes as Transformable Directing Groups for Pd-Catalyzed C−H Bond Functionalization
作者:Sharon R. Neufeldt、Melanie S. Sanford
DOI:10.1021/ol902720d
日期:2010.2.5
O-Acetyl oximes serve as effective directing groups for Pd-catalyzed sp(2) and sp(3) C-H functionalization reactions. The C-H functionalization products can be subsequently transformed into ortho- or beta-functionalized ketones, alcohols, amines, and heterocycles.