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Zenichi Yoshida (1925-2023)

Professor. Zenichi Yoshida,
a member of the Honorary Advisors of HETEROCYCLES (1975-1998),
has passed away on May 4, 2023 at the age of 97.
I deeply express my regret over his death.
Kunio Ogasawara
Editor
May 11, 2023
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Published online, 27th September, 2005
■ Concise Route to 4,5-Dioxo-4,5-dihydronaphtho[1,2-b]thiophene-2-carboxylates
Kazuhiro Kobayashi,* Satoshi Yamane, Kazuna Miyamoto, Osamu Morikawa, and Hisatoshi Konishi
*Department of Materials Science, Faculty of Engineering, Tottori University, Koyama-minami, Tottori 680-8552, Japan
Abstract
Reactions of 3-acyl-1,2-naphthoquinones with ethyl mercaptoacetate followed by protection of the resulting hydroxyl groups and thiophene ring formation using 1-trimethylsilylimidazole, deprotection with hydrochloric acid, and oxidation with cerium(IV) ammonium nitrate (CAN) gave, in one-pot, the title thienonaphthoquinone derivatives in moderate to good yields.
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