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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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Communication | Regular issue | Vol 12, No. 8, 1979, pp.1027-1030
Published online, 1st January, 1970■ Cyclic Tautomers of Tryptophans and Tryptamines II. Synthesis of 5-Nitro-, 5-Methoxy-, and 6-Methoxy-tryptophan Derivatives
Published online, 1st January, 1970
DOI: 10.3987/R-1979-08-1027
■ Cyclic Tautomers of Tryptophans and Tryptamines II. Synthesis of 5-Nitro-, 5-Methoxy-, and 6-Methoxy-tryptophan Derivatives
Tohru Hino,* Mikiko Taniguchi, Akinori Gonsho, and Masako Nakagawa
*Faculty of Pharmaceutical Sciences, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
Abstract
Nitration of the cyclic tautomer (2b) of Nb-methoxycarbonyl-DL-tryptophan methyl ester with fuming nitric acid followed by treatment with sulfuric acid in methanol gave 5-nitro-Nb-methoxycarbonyl-DL-tryptophan methyl ester (5) in excellent yield. The reaction of 2b with lead tetraacetate in trifluoroacetic acid followed by methylation provided 6-methoxy- (major) and 5-methoxy- (minor) derivatives (7 and 8) which were readily converted to 6- and 5-methoxytryptophan derivatives (10 and 11).
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