HETEROCYCLES
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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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e-Journal
Abstract
1 data found. 1 - 1 listed
Paper | Regular issue | Vol 68, No. 9, 2006, pp. 1893 - 1899
Published online: 11th July, 2006
■ Bromination of Dimethyl 1-Substituted Indole-2,3-dicarboxylates
PDF (561KB)
Published online: 11th July, 2006
DOI: 10.3987/COM-06-10796
■ Bromination of Dimethyl 1-Substituted Indole-2,3-dicarboxylates
Yasuyoshi Miki,* Misako Umemoto, Mai Nakamura, Hajime Hibino, Noriko Ohkita, Akiko Kato, and Yoshiyuki Aoki
*Faculty of Pharmaceutical Sciences, Kinki University, 3-4-1, Kowakae, Higashi-Osaka 577-8502, Japan
Abstract
Treatment of dimethyl indole-2,3-dicarboxylate with pyridinium hydrobromide perbromide or bromine in the presence of Lewis acid gave dimethyl 5 bromoindole-2,3-dicarboxylate as the sole product. In a similar manner, dimethyl 1-benzyl- and 1-benzenesulfonyl-indole-2,3-dicarboxylates provided a mixture of the corresponding 5 bromoindole and 6-bromoindole derivatives. However, methyl 1-trifluoromethanesulfonylindole-2,3-dicarboxylate gave methyl 6-bromo-1-trifluoromethanesulfonylindole-2,3-dicarboxylate as a major product.
1 data found. 1 - 1 listed
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