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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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Report | Regular issue | Vol 23, No. 5, 1985, pp.1225-1228
Published online, 1st January, 1970■ Reactivity of Conjugated Enaminothioamides toward Activated Acetylenic Compounds
Published online, 1st January, 1970
DOI: 10.3987/R-1985-05-1225
■ Reactivity of Conjugated Enaminothioamides toward Activated Acetylenic Compounds
Serge Coen, Bernard Ragonnet, Catherine Vieillescazes, and Jean-Pierre Roggero*
*Faculté des Sciences, Laboratorie de Chimie Organique, 33, rue Louis Pasteur, 84000 Avignon, France
Abstract
Conjugated enaminothioamides react in high-yield with acetylenedicarboxylic acid or its ester derivatives to give 2-enaminathiazolin-4-ones. A similar reaction is observed with propiolic acid and derivatives, giving 2-enamino-1,3-thiazin-4-ones. A substituted thiazoline is quantitatively obtained from propargyl bromide.
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