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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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Communication | Regular issue | Vol 51, No. 9, 1999, pp.2029-2033
Published online, 1st January, 1970■ Lewis Acid-mediated Ring Expansion Reaction of 2,3-Methanochromanones with Silyl Enol Ethers
Published online, 1st January, 1970
DOI: 10.3987/COM-99-8638
■ Lewis Acid-mediated Ring Expansion Reaction of 2,3-Methanochromanones with Silyl Enol Ethers
Yosiaki Sugita, * Kazuyoshi Kawai, Hiroki Hosoya, and Ichiro Yokoe
*Faculty of Pharmaceutical Sciences, Josai University, 1-1 Keyakidai, Sakado, Saitama 350-0295, Japana
Abstract
In the presence of trimethylsilyl trifluoromethanesulfonate (TMSOTf), methanochromanones easily reacted with silyl enol ethers to give the [3+2] cycloadducts and the corresponding adducts in good yields.
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