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Obituary
Yoshito Kishi (1937-2023)
Yoshito Kishi (1937-2023)
Professor. Yoshito Kishi,
a member of the Honorary Editorial Associates of HETEROCYCLES,
has passed away on January 9, 2023 at the age of 85.
I deeply express my regret over his death.
Kunio Ogasawara
Editor
January 13, 2023
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Paper | Regular issue | Vol 53, No. 3, 2000, pp.657-664
Published online, 1st January, 1970■ Synthesis of Tetrahydrofuro[2,3-b][1]benzopyranones by the Ring-Expansion Reaction of Methanochromanone with Symmetric Ketones
Published online, 1st January, 1970
DOI: 10.3987/COM-99-8810
■ Synthesis of Tetrahydrofuro[2,3-b][1]benzopyranones by the Ring-Expansion Reaction of Methanochromanone with Symmetric Ketones
Yoshiaki Sugita,* Kazuyoshi Kawai, and Ichiro Yokoe
*Faculty of Pharmaceutical Sciences, Josai University, Sakado, Saitama 350-0295, Japan
Abstract
In the presence of SnCl4, 2,3-dimethoxycarbonylmethanochromanone (8) was transformed into a zwitterion which easily reacted with symmetric ketones to give the tetrahydrofuro[2,3-b][1]benzopyranone derivatives in good yields with high diastereoselectivity.
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