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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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Communication | Regular issue | Vol 22, No. 8, 1984, pp.1693-1695
Published online, 1st January, 1970■ Synthesis of 3-Ethylpyrazolo[3,4-e][1,3]oxazin-5,7-dione, a Derivative of a New Heterocyclic Ring System
Published online, 1st January, 1970
DOI: 10.3987/R-1984-08-1693
■ Synthesis of 3-Ethylpyrazolo[3,4-e][1,3]oxazin-5,7-dione, a Derivative of a New Heterocyclic Ring System
Vladimir G. Beylin and Leroy B. Townsend*
*Department of Chemisry, University of Michigan , 930 North University, Ann Arbor, MI 48109-1055, U.S.A.
Abstract
The Synthesis of 3-ethylpyrazolo[3,4-e][1,3]oxanin-5,7-dione, a derivative of a new ring system, by annulation of 3(5)-ethyl-4-hydroxy-5(3)-carboxamidopyrazole with ethyl chloroformate or N,N’-carbonyldiimidazole is described.
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