Palladium-Catalyzed Oxidative CH Bond Acylation of Acetanilides with Benzylic Alcohols
作者:Yu Yuan、Duanteng Chen、Xiaowei Wang
DOI:10.1002/adsc.201100417
日期:2011.12
An efficient and clean method to construct CC bonds has been developed via the acylation reaction of acetanilides with benzylic alcohols using tert-butyl hydroperoxide (TBHP) as oxidant catalyzed by palladium acetate in the presence of triflic acid (TfOH). The acylation reactions exhibit excellent reactivities, and up to 95% yield of the corresponding aryl ketone could be obtained under the optimal
Palladium-Catalyzed Direct <i>ortho</i>-Acylation through an Oxidative Coupling of Acetanilides with Toluene Derivatives
作者:Zhangwei Yin、Peipei Sun
DOI:10.1021/jo302125h
日期:2012.12.21
A facile ortho-acylation of acetanilides by a Pd-catalyzed oxidative C–H activation was developed in which low toxic, stable, and commercially available toluene derivatives were first used as acylation reagents by a tandem reaction to form o-acylacetanilides with moderate to good yields. Inexpensive, safe, and environmentally benign TBHP was proved to be an effective oxidant for these transformations
Palladium-Catalyzed ortho-Acylation of Acetanilides with Aldehydes through Direct CH Bond Activation
作者:Chengliang Li、Lei Wang、Pinhua Li、Wei Zhou
DOI:10.1002/chem.201101192
日期:2011.9.5
Easy access to o‐acyl acetanilides: A new Pd‐catalyzed ortho‐acylation of acetanilides with both aromatic and aliphatic aldehydes has been developed based on a CH activation process. In the presence of tert‐butyl hydroperoxide (TBHP) as the ideal oxidant, this reaction provides an efficient access to ortho‐acyl acetanilides in good yields (see scheme).
Palladium‐catalyzed cross‐dehydrogenative coupling between anilides and aromatic aldehydes was achieved under aqueous conditions. A wide variety of the desired benzophenone derivatives was isolated in good to excellent yield. The reaction rate acceleration effect of acid and detergent has been demonstrated. Mechanistic insight has been obtained from quantum chemical calculations.
Activation of C–H Activation: The Beneficial Effect of Catalytic Amount of Triaryl Boranes on Palladium-Catalyzed C–H Activation
作者:Orsolya Tischler、Zsófia Bokányi、Zoltán Novák
DOI:10.1021/acs.organomet.5b01017
日期:2016.3.14
Herein we report a novel approach to the acceleration of palladium-catalyzed C-H activation reactions. We demonstrated that the utilization of electron-deficient triaryl boranes as Lewis acidic cocatalysts of palladium enables the directed cross dehydrogenative coupling of aldehydes and anilides under mild reaction conditions. Study of the kinetic profile of the transformation reveals a unique, unexpectedly long induction period of the transformation.