Titanium-Catalyzed Hydroaminoalkylation of Alkenes by CH Bond Activation at sp<sup>3</sup>Centers in the α-Position to a Nitrogen Atom
作者:Raphael Kubiak、Insa Prochnow、Sven Doye
DOI:10.1002/anie.200805169
日期:2009.1.26
Good for primary and secondary amines: Hydroaminoalkylations of alkenes, which take place by CHbondactivation in the α‐position to nitrogen atoms, are catalyzed by various neutral titanium complexes (see scheme). Primary as well as secondary amines can be used as substrates, and the reactions can be achieved intra‐ and intermolecularly.
An easily accessible formamidinate ligand-bearing titanium complex initially synthesized by Eisen et al. is used as catalyst for intermolecularhydroaminoalkylation reactions of unactivated, sterically demanding 1,1- and 1,2-disubstituted alkenes and styrenes with secondary amines. The corresponding reactions, which have never been achieved with titanium catalysts before, take place with excellent