title: Importance of a Fluorine Substituent for the Preparation of meta- and para-Pentafluoro-λ(6) -sulfanyl-Substituted Pyridines.
abstract: Although there are ways to synthesize ortho-pentafluoro-λ(6) -sulfanyl (SF5 ) pyridines, meta- and para-SF5 -substituted pyridines are rare. We disclose herein a general route for their synthesis. The fundamental synthetic approach is the same as reported methods for ortho-SF5 -substituted pyridines and SF5 -substituted arenes, that is, oxidative chlorotetrafluorination of the corresponding disulfides to give pyridylsulfur chlorotetrafluorides (SF4 Cl-pyridines), followed by chloride/fluoride exchange with fluorides. However, the trick in this case is the presence on the pyridine ring of at least one fluorine atom, which is essential for the successful transformation of the disulfides into m-and p-SF5 -pyridines. After enabling the synthesis of an SF5 -substituted pyridine, ortho-F groups can be efficiently substituted by C, N, S, and O nucleophiles through an SN Ar pathway. This methodology provides access to a variety of previously unavailable SF5 -substituted pyridine building blocks.
authors.affiliation: Department of Nanopharmaceutical Sciences, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya, 466-8555, Japan.
authors.forename: Mikhail
authors.initials: M
authors.lastname: Kosobokov
authors.affiliation: Department of Nanopharmaceutical Sciences, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya, 466-8555, Japan.
authors.forename: Benqiang
authors.initials: B
authors.lastname: Cui
authors.affiliation: Department of Nanopharmaceutical Sciences, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya, 466-8555, Japan.
authors.forename: Andrii
authors.initials: A
authors.lastname: Balia
authors.affiliation: Department of Nanopharmaceutical Sciences, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya, 466-8555, Japan.
authors.forename: Kohei
authors.initials: K
authors.lastname: Matsuzaki
authors.affiliation: Department of Nanopharmaceutical Sciences, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya, 466-8555, Japan.
authors.forename: Etsuko
authors.initials: E
authors.lastname: Tokunaga
authors.affiliation: Pharmaceutical Division, Ube Industries, Ltd., Seavans North Bldg, 1-2-1 Shibaura, Minato-ku, Tokyo, 105-8449, Japan.
authors.forename: Norimichi
authors.initials: N
authors.lastname: Saito
authors.affiliation: Department of Nanopharmaceutical Sciences, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya, 466-8555, Japan. nozshiba@nitech.ac.jp.
authors.forename: Norio
authors.initials: N
authors.lastname: Shibata
keywords: chlorination; fluorination; fluorine; nitrogen heterocycles; pentafluorosulfanyl substitution