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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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Paper | Regular issue | Vol 53, No. 10, 2000, pp.2191-2199
Published online, 1st January, 1970■ Reaction of 3-Iodochromone with Nucleophiles. 2. Reaction with Mercaptoazoles
Published online, 1st January, 1970
DOI: 10.3987/COM-00-9007
■ Reaction of 3-Iodochromone with Nucleophiles. 2. Reaction with Mercaptoazoles
Yoshiaki Sugita,* Shengzhen Yin, and Ichiro Yokoe*
*Faculty of Pharmaceutical Sciences, Josai University, Sakado, Saitama 350-0295, Japan
Abstract
3-Iodochromone (1a) easily reacted with mercaptoazoles in the presence of potassium carbonate to give 3-azolylthiochromones in good yields. In the case of 2-mercaptobenzimidazole (2a) as a nucleophile, the benzimidazo[2,1-b]thiazole derivative (4a) was obtained as the major product along with 3-(1H-benzimidazol-2-ylthio)chromone (3a). The ratio of the two products was found to be affected by the electron density on the nitrogen atom in the benzimidazole ring.
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