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Obituary
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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Short Paper | Regular issue | Vol 83, No. 4, 2011, pp.867-874
Published online, 2nd March, 2011
Published online, 2nd March, 2011
DOI: 10.3987/COM-11-12138
■ Synthesis of Caboxamycin and Its Derivatives Using Eco-Friendly Oxidation
Yoshinobu Tagawa,* Hiroki Koba, Kazuhiro Tomoike, and Kunihiro Sumoto
*Faculty of Pharmaceutical Sciences, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, Japan
Abstract
The reaction of 3-hydroxyanthranilic acid or methyl 3-hydroxyanthranilate with O-benzylsalicylaldehyde in xylenes gave benzoxazole derivatives, which lead to a novel benzoxazole antibiotic, caboxamycin via debenzylation or demethylation in good yield, in the presence of dry activated carbon and bubbling molecular oxygen. The present reaction involves the simple procedure, easy workup and environmentally benign materials such as reusable activated carbon and molecular oxygen.
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