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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
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May 11, 2023
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Communication | Regular issue | Vol 38, No. 2, 1994, pp.249-252
Published online, 1st January, 1970■ Novel Synthesis of Substituted Pyrimidines: A Ring Transformation of 3-Methyl-5-nitropyrimidin-4(3H)-one
Published online, 1st January, 1970
DOI: 10.3987/COM-93-6569
■ Novel Synthesis of Substituted Pyrimidines: A Ring Transformation of 3-Methyl-5-nitropyrimidin-4(3H)-one
Nagatoshi Nishiwaki, Tomoko Matsunaga, Yasuo Tohda, and Masahiro Ariga*
*Department of Chemistry, Osaka Kyoiku University, 4-698-1 Asahigaoka, Kashiwara, Osaka 582-8582, Japan
Abstract
A novel ring transformation of 3-methyl-5-nitropyrimidin-4(3H)-one with ketones in the presence of ammonia was found to be an elegant method for synthesizing 5,6-disubstituted pyrimidines. Tetrahydroquinazoline was readily obtained in good yields when cyclohexanone was employed as a substrate. The present reaction was applicable to cyclopentanone, acetophenone and p-nitroacetophenone to give the corresponding pyrimidine derivatives.
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