Iron-Phosphine Complex-Catalyzed Intramolecular C(sp3)-H Amination of Azides.

Fe(II)-phosphine complex [Fe(dpbz)]Cl2 was demonstrated to be effective for the intramolecular C(sp3)-H amination of organic azides. This catalyst exhibited a high catalytic capacity for the transformations from α-azido amides to imidazolinones. Cyclization of simple aliphatic azides can be realized as well by using [Fe(dpbz)]Cl2 as the catalyst.