Copper Acetoacetonate [Cu(acac)<sub>2</sub>]/BINAP-Promoted C<i>sp</i><sup>3</sup>N Bond Formation<i>via</i>Reductive Coupling of<i>N</i>-Tosylhydrazones with Anilines
AbstractWe report the the copper(II) acetoacetonate [Cu(acac)2]/BINAP‐catalyzed synthesis of arylamines from N‐tosylhydrazones and anilines. A fine tuning of the reaction conditions was required to accomplish the cross‐coupling successfully, including the ligands effect and the addition of small amounts of water. The characteristic feature of this protocol is its functional group compatibility and its chemoselectivity when various aminophenol derivatives were used. Taking into consideration the interest for this copper‐reductive coupling in which no stoichiometric metal hydride reagent is employed, this can be considered as an alternative to the conventional reductive amination.magnified image
Development of New Hydrogenations of Imines and Benign Reductive Hydroaminations: Zinc Triflate as a Catalyst
The hydrogenation of imines to amines in the presence of catalytic amounts of zinctriflate has been demonstrated for the first time. In addition, an efficient procedure for the reductivehydroamination of alkynes to amines is presented using zinctriflate as a catalyst precursor. In both protocols a variety of different functional groups are tolerated, and the reactions proceed smoothly in high yields