1,7-Palladium Migration via C−H Activation, Followed by Intramolecular Amination: Regioselective Synthesis of Benzotriazoles
摘要:
A novel 1,7-palladium migration-cyclization-dealkylation sequence for the regioselective synthesis of benzotriazoles has been developed. These reactions proceed in excellent yields with high regioselectivities. The mechanism of the reaction has also been investigated.
The functionalized benzotriazoles are prepared by palladium catalyzed intramolecularamination of 2-bromodiaryltriazene. By screening the reaction conditions, such as ligand, solvent, base and reaction concentration, the optimal reaction conditions were obtained, and 28 functionalized benzotriazole derivatives were successfully prepared up to 99% yield. The method is easy to operate and has good tolerance