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Yoshito Kishi (1937-2023)
Yoshito Kishi (1937-2023)
Professor. Yoshito Kishi,
a member of the Honorary Editorial Associates of HETEROCYCLES,
has passed away on January 9, 2023 at the age of 85.
I deeply express my regret over his death.
Kunio Ogasawara
Editor
January 13, 2023
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Paper | Regular issue | Vol 36, No. 4, 1993, pp.833-844
Published online, 1st January, 1970■ Synthesis of Pyrazole C-Glycosides by 1,3-Dipolar Cycloaddition of Nitrilimines Formed by Lead Tetraacetate Oxidation of p-Nitrophenylhydrazones of Aldehydo Sugars
Published online, 1st January, 1970
DOI: 10.3987/COM-92-6244
■ Synthesis of Pyrazole C-Glycosides by 1,3-Dipolar Cycloaddition of Nitrilimines Formed by Lead Tetraacetate Oxidation of p-Nitrophenylhydrazones of Aldehydo Sugars
Jean M. J. Tronchet,* Jeannine F. Tronchet, and Françoise Barbalat-Rey
*Institute of Pharmaceutical Chemistry, University of Geneva, 30, Quai e.-Ansermet, CH-1211 Geneva 4, Switzerland
Abstract
Aldehydo sugars p-nitrophenylhydrazones upon treatment with lead tetraacetate in the presence of an excess of methyl acrylate afforded, besides N’-acetylhydrazide derivatives, methyl 3-glycosyl-1-p-nitrophenylpyrazoline-5-carboxylates which were readily oxidized to the corresponding pyrazoles. The methyl pyrazole-5-carboxylates were converted to 5-carboxamides.
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