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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 | Regular issue | Vol 48, No. 1, 1998, pp.79-93
Published online, 1st January, 1970■ Synthesis and Confirmation of the Structures of Polonicumtoxins A, B and C
Published online, 1st January, 1970
DOI: 10.3987/COM-97-8006
■ Synthesis and Confirmation of the Structures of Polonicumtoxins A, B and C
Mari Yotsu-Yamashita, Takeshi Yasumoto,* and Viresh H. Rawal*
*Faculty of Agriculture, Tohoku University, 1-1, Tsutsumidori, Amamiya, Aoba-ku, Sendai, 981, Japan
Abstract
Total syntheses of polonicumtoxins A (1), B (2), and C (3) have been completed. The key step of the syntheses involves and aza-Wittig reaction for the construction of the cyclic ketimine. The synthetic compounds were found to be identical in all respects with the natural products, thus confirming their assigned structures.
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