Efficient Amination of Activated and Non‐Activated C(sp3)‐H Bonds with Simple Iron‐Phenanthroline Catalyst

A readily available catalyst consisting of iron dichloride in combination with 1,10-phenanthroline catalyzes the ring-closing C-H amination of N -benzoyloxyurea to form imidazolidin-2-ones in high yields. The C-H amination reaction is very general and applicable to benzylic, allylic, propargylic, and completely non-activated aliphatic C(sp 3 )-H bonds, and it also works for C(sp 2 )-H bonds. The surprisingly simple method can be performed under open flask conditions.