Ring-opening fluorination, in which a fluorine atom is introduced onto a cyclic compound with concomitant ring cleavage, has recently attracted attention as a useful method for efficiently constructing complex fluorine-containing skeletons (Figure ). Although ring-opening fluorinations have recently been reported, most are limited to three-or four-membered ring starting materials such as epoxides, cyclopropanes/butanes, and aziridines, which have strained chemical bonds. As one of a few examples of ring-opening fluorination involving C-C bond cleavage in a ring size ≥ 5, the Sarpong group reported an elegant ring-opening fluorination of cyclic amines (Figure ). The Leonori group also discovered a ringopening fluorination of cyclic oxime ethers under visible light irradiation. In the heteroatom-heteroatom (X-Y) bond paradigm, the Yao group reported a ring-opening fluorination using isoxazoline Noxides via O-N bond cleavage (Figure ). However, all these methods require the use of highly specific substrates, and fluorinations involving the ring opening of aromatic rings or asymmetric fluorination have not yet been reported.