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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Note | Regular issue | Vol 63, No. 11, 2004, pp.2623-2626
Published online, 1st October, 2004■ A Synthesis of a Novel Heterocyclic System: 2H-Furo[3,2-b][1,4]benzothiazin-2-one
Published online, 1st October, 2004
DOI: 10.3987/COM-04-10208
■ A Synthesis of a Novel Heterocyclic System: 2H-Furo[3,2-b][1,4]benzothiazin-2-one
Anton V. Dolzhenko and Wai-Keung Chui*
*Department of Pharmacy, Faculty of Science, National University of Singapore, 18 Science Drive 4, Singapore 117543, Singapore
Abstract
A synthesis of 3-methyl-2H-furo[3,2-b][1,4]benzothiazin-2-ones (10a,b) is described. o-Aminothiophenols (1a,b) undergo condensation with citraconic anhydride followed by cyclization and oxidation of the resulting 2-(3,4-dihydro-2H-1,4-benzothiazin-2-yl)propanoic acids (5) with thionyl chloride gives moderate yield of 10a,b.
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