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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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Paper | Special issue | Vol 56, No. 1-2, 2002, pp.257-264
Published online, 1st January, 1970■ Synthesis of the Bicyclic Secondary Amines via Dimethylaminomethylene Ketones from 3-Pyrrolidone and 4-Piperidone
Published online, 1st January, 1970
DOI: 10.3987/COM-01-S(K)25
■ Synthesis of the Bicyclic Secondary Amines via Dimethylaminomethylene Ketones from 3-Pyrrolidone and 4-Piperidone
Hideto Fukui,* Kiyoshi Inoguchi, and Jun Nakano
*Central Research Institute, Kaken Pharmaceutical Co., Ltd., Shinomiya, Minamikawara-cho, Yamashina-ku, Kyoto 607-8042, Japan
Abstract
The reaction of N-protected 3-pyrrolidone and 4-piperidone with N,N-dimethylformamide dimethyl acetal gave the dimethylaminomethylene ketones, which reacted with several types of hydrazines, amidines, and guanidine to afford the secondary amines having fused ring system.
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