A mild and efficient protocol for the synthesis of 2,2′-difunctional biaryls from readily available benzamides and oximes by Co(OAc)2·4H2O catalysis has been developed. The catalytic cycle that includes aerobic oxidation of Co(I) to Co(III) is successfully achieved for the first time through dual-chelation-assisted C–H/C–H coupling with the assistance of catalytic Mn(acac)3. The catalytic system exhibits
Cobalt-Catalyzed Directed<i>sp</i><sup>2</sup>C−H Acetoxylation of Arenes Employing Mn(OAc)<sub>3</sub> ⋅ 2H<sub>2</sub>O as Acetoxy Source
作者:Writhabrata Sarkar、Arup Bhowmik、Aniket Mishra、Tripta Kumari Vats、Indubhusan Deb
DOI:10.1002/adsc.201800398
日期:2018.9.3
A cobalt‐catalyzed sp2 C−H acetoxylation of amides having 8‐aminoquinoline as a directing group has been achieved using manganese(III) acetate both as an oxidant and an acetoxysource. Operational simplicity, broad range of functional group tolerance, use of an earth abundant first row transition metal, and, most importantly, exploitation of an unprecedented acetoxysource are the key features. The
Copper-Promoted Sulfenylation of sp<sup>2</sup> C–H Bonds
作者:Ly Dieu Tran、Ilya Popov、Olafs Daugulis
DOI:10.1021/ja3092278
日期:2012.11.7
An auxiliary-assisted, copper catalyzed or promoted sulfenylation of benzoic acid derivative beta-C-H bonds and benzylamine derivative gamma-C-H bonds has been developed. The method employs disulfide reagents, copper(II) acetate, and DMSO solvent at 90-130 degrees C. Application of this methodology to the direct trifluoromethylsulfenylation of C-H bonds was demonstrated.
Nickel(II)-Mediated Regioselective CH Monoiodination of Arenes and Heteroarenes by using Molecular Iodine
作者:Bhuttu Khan、Ruchir Kant、Dipankar Koley
DOI:10.1002/adsc.201600177
日期:2016.7.14
nickel(II)‐mediated ortho‐iodination of benzamides using molecular iodine has been developed. The process is highly regioselective and furnishes only monoiodinated products. A broad range of arenes and heteroarenes with diverse functional groups provided monoiodinated products in good to excellent yields.