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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 16, No. 4, 1981, pp.559-561
Published online, 1st January, 1970■ A New Synthesis of Pyrimido[5,4-e]-as-triazine Derivatives
Published online, 1st January, 1970
DOI: 10.3987/R-1981-04-0559
■ A New Synthesis of Pyrimido[5,4-e]-as-triazine Derivatives
Keitaro Senga* and Sadao Nishigaki
*Pharmaceutical Institute, School of Medicine, Keio University, Shinanomachi 35, Shinjuku, Tokyo 160-0016, Japan
Abstract
The reaction of 5-arylazo-6-arylidenehydrazino-1,3-dimethyluracils (II), prepared by the diazotization of 6-arylidenehydrazino-1,3-dimethyluracils (I), with dimethylformamide dimethylacetal afforded the corresponding 3-arylfervenulins (3-aryl-6,8-dimethylpyrimido[5,4-e]-as-triazine-5,7(6H, 8H)-diones) (V).
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