HETEROCYCLES
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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
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May 11, 2023
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Paper | Regular issue | Vol 51, No. 9, 1999, pp.2111-2118
Published online, 1st January, 1970■ The Preparation of 1-Methyl- (and Ethyl)-1,4-dihydro-4-oxo- and 4-thioxo-3-quinolinesulfonamides from 4-Amino-3-quinolinesulfonamides
Published online, 1st January, 1970
DOI: 10.3987/COM-99-8607
■ The Preparation of 1-Methyl- (and Ethyl)-1,4-dihydro-4-oxo- and 4-thioxo-3-quinolinesulfonamides from 4-Amino-3-quinolinesulfonamides
Leszek Skrzypek
*Department of Organic Chemistry, Sileaian School of Medicine, Jagiellonska Str. 4, 41-200 Sosnowiec, Poland
Abstract
Basic hydrolysis of 1-methyl or 1-ethyl-4-amino-3-aminosulfonylqui- nolinium alkyl sulfates (4) obtained from 4-amino-3-quinolinesulfonamides (2) yields 1-methyl- and 1-ethyl-1,4-dihydro-4-oxo-3-quinolinesulfonamides (5). Salts (4) reacted with sodium hydrosulfide to give sulfur analogs of the compounds (5), i.e., 1-alkyl-1,4-dihydro-4-thioxo-3-quinolinesulfonamides (7).
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