Site-selective 18 F fluorination of unactivated C-H bonds mediated by a manganese porphyrin.

The first direct C-H 18 F fluorination reaction of unactivated aliphatic sites using no-carrier-added [18 F]fluoride is reported. Under the influence of a manganese porphyrin/iodosylbenzene system, a variety of unactivated aliphatic C-H bonds can be selectively converted to C-18 F bonds. The mild conditions, broad substrate scope and generally inaccessible regiochemistry make this radio-fluorination a powerful alternate to established nucleophilic substitution for the preparation of 18 F labeled radio tracers.