Mn-Catalyzed oxidative amination of benzylic C(sp3)–H bonds with nitriles is disclosed, which enables the synthesis of a broad range of secondary amides in moderate to excellent yields under mild conditions. The interaction between Mn(III) and DDQ facilitates the oxidation and makes it highlyefficient and selective.
Reactions between various benzyl alcohols or tert-butyl alcohol and nitriles were carried out in the presence of catalytic amounts (usually 10–20 mol-%) of o-benzenedisulfonimide as a Bronsted acidcatalyst; the reaction conditions were mild and the yields of amides were good. The catalyst was easily recovered and purified, ready to be used in further reactions, with economic and ecological advantages
Au(iii)-catalyzed intermolecular amidation of benzylic C–H bonds
作者:Yan Zhang、Bainian Feng、Chengjian Zhu
DOI:10.1039/c2ob26857d
日期:——
Au(III)-catalyzed intermolecular amidations of benzylic C–H bonds with sulfonamides and carboxamides are described. The protocol with the Au–bipy complex/N-bromosuccinimide system provides practical applications for synthesis of various amides via C–H activations. The reaction proceeds with high efficiency to give the corresponding amines, which are extremely useful synthetic intermediates.
An expedient, efficient and solvent-free synthesis of T3P®-mediated amidation of benzhydrols with poorly reactive N-nucleophiles under MW irradiation
作者:Srinivas Cheruku、Sandhya C. Nagarakere、Makanahalli P. Sunilkumar、Yatheesh Narayana、Kumara N. Manikyanally、Kanchugarakoppal S. Rangappa、Kempegowda Mantelingu
DOI:10.1039/d1nj04502d
日期:——
An expedient, efficient, economical, environmentally benign, and solvent free amidation protocol of benzhydrols with less reactive nitrogen nucleophiles assisted by propylphosphonic anhydride (T3P®) under microwave irradiation has been developed. The methodology has been deployed for a wide range of heterocycles and electron-withdrawing & electron-donating groups. The protocol resulted in good to excellent