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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 | Regular issue | Vol 55, No. 1, 2001, pp.91-98
Published online, 1st January, 1970■ Synthesis of a 2,3-Dimethoxyrotenonoid
Published online, 1st January, 1970
DOI: 10.3987/COM-00-9062
■ Synthesis of a 2,3-Dimethoxyrotenonoid
Karla-Sue C. Marriott, Mario Anderson, and Yvette A. Jackson*
*Department of Chemistry, Mona Campus, University of the West Indies, Mona, Kingston 7, Jamaica, West Indies Jamaica
Abstract
Photo-Fries rearrangement of the o- fluoro ester of 3-hydroxy-6, 7-dimethoxycoumarin yielded the corresponding 3-hydroxy-4-(2-fluorobenzoyl)-coumarin which, in the presence of potassium carbonate, cyclised to the 2,3-dimethoxyrotenonoid. (1)-Benzofuran-(2, 3-c)–(6H, 12H)-(1)–benzoxepin- 6-ones underwent oxidation to the corresponding β-rotenonoids reluctantly.
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