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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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Paper | Regular issue | Vol 48, No. 11, 1998, pp.2347-2352
Published online, 1st January, 1970■ Syntheses of Fluorine-containing 1,2-Dihydropyrimidines and Pyridines from β,β-Bis(trifluoroacetyl)vinylamine, Ketones and Ammonia
Published online, 1st January, 1970
DOI: 10.3987/COM-98-8325
■ Syntheses of Fluorine-containing 1,2-Dihydropyrimidines and Pyridines from β,β-Bis(trifluoroacetyl)vinylamine, Ketones and Ammonia
Etsuji Okada,* Tatsuhiko Kinomura, and Yukio Higashiyama
*Department of Chemical Science andd Engineerring, Faculty of Engineering, Kobe University, Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan
Abstract
β,β-Bis(trifluoroacetyl)vinylamine (1) reacted easily with various ketones in the presence of aqueous ammonia under mild conditions to give trifluoroacetylated 4-trifluoromethyl-1,2-dihydropyrimidines (4), α-trifluoromethylpyridines (5), and γ-trifluoromethylpyridines (6) in moderate yields.
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