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Paper | Special issue | Vol 101, No. 2, 2020, pp.461-470
Published online, 16th August, 2019
DOI: 10.3987/COM-19-S(F)29
Formation of Seven-Membered-Ring Fused Bithiophene Derivatives by Nosyl Annulation

Atsunori Mori,* Masayasu Hayashi, Mitsuru Matsuoka, Shiomi Ashida, Yukiko Ito, Kohei Hosokawa, Toyoko Suzuki, Kentaro Okano, Chi-Hsien Wang, and Masaki Horie

*Department of Chemical Science and Engineering, Kobe University, Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan


Nosyl annulation of a bithiophene derivative with nosylamide (NsNH2) gives a 5-7-5 fused N, S-heterocyclic compound. The detailed molecular structure of the obtained nosylamide was analyzed by single-crystal X-ray crystallography. The obtained product was transformed into several amines and amides. The CBr bond at the fused heterocycle was also subjected to cross-coupling reactions, where the nosyl group was found to be tolerant.