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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 34, No. 8, 1992, pp.1623-1630
Published online, 1st January, 1970■ Synthesis of 5,8-Quinoxalinediones and 5,8-Quinazolinediones
Published online, 1st January, 1970
DOI: 10.3987/COM-92-6102
■ Synthesis of 5,8-Quinoxalinediones and 5,8-Quinazolinediones
Yoshiyasu Kitahara, Shinsuke Nakahara, Yoshihiro Tanaka, and Akinori Kubo*
*Meiji College of Pharmacy, 1-35-23 Nozawa, Setagaya-ku, Tokyo 154, Japan
Abstract
5,8-Quinoxalinediones (3a-c, 12, 13), dibenzo[a,c]phenazine-10,13-diones (5a, b), 5,8-quinazolinediones (17, 23), and 4,5,8(3H)-quinazolinetrione (21) were prepared using oxidative demethylation of the corresponding 5,8-dimethoxy compounds with cerium (IV) ammonium nitrate.
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