Intramolecular Hydroamination Reactions Catalyzed by Neutral and Cationic Group IV Pyridylamido Complexes

Zr(IV) and Hf(IV) benzyl(neutral or cationic) and amido catalysts stabilized by pyridylamido ligandsare found to be good candidates for the intramolecular hydroamination/cyclization of primary andsecondary aminoalkenes. In particular, cationic monobenzyl derivatives have shown remarkable catalytic activity for the production of five and six-membered N-containing heterocycles from secondary amino alkenes. In addition, Zr (IV) and Hf(IV) amido derivatives that are produced by atemperature-controlled prototropic rearrangement have provided evidence of the central role playedbythe metal coordination sphere in promoting such catalytic transformationsefficiently .