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Obituary
Zenichi Yoshida (1925-2023)
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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Short Paper | Regular issue | Vol 87, No. 11, 2013, pp.2361-2368
Published online, 30th September, 2013
Published online, 30th September, 2013
DOI: 10.3987/COM-13-12819
■ Synthesis of Dihydrooxepins by the Cycloaddition of 2-Amino-4,5-dihydro-3-furancarbonitriles with Dimethyl Acetylenedicarboxylate
Fumi Okabe, Hiroshi Maruoka,* Eiichi Masumoto, Toshihiro Fujioka, and Kenji Yamagata
*Faculty of Pharmaceutical Sciences, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, Japan
Abstract
A facile and efficient synthesis of dihydrooxepins is described. Treatment of readily available 2-amino-4,5-dihydro-3-furancarbonitriles with dimethyl acetylenedicarboxylate at room temperature caused smoothly a cycloaddition reaction, followed by a ring expansion, giving the corresponding dihydrooxepin derivatives.
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