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 51, No. 9, 1999, pp.2159-2162
Published online, 1st January, 1970■ Chemo- and Regioselective Nucleophilic Reactions of (Bromomethyl)methylmaleic Anhydride: Synthesis of α-Quinoxalinyl- and α-Benzothiazinylacrylic Acids
Published online, 1st January, 1970
DOI: 10.3987/COM-99-8577
■ Chemo- and Regioselective Nucleophilic Reactions of (Bromomethyl)methylmaleic Anhydride: Synthesis of α-Quinoxalinyl- and α-Benzothiazinylacrylic Acids
Anil M. Deshpande, Arvind A. Natu, and Narshinha P. Argade*
*Division of Organic Chemistry (Synthesis), National Chemical Laboratory, Pune 411 008, India
Abstract
The (bromomethyl)methylmaleic anhydride (2) on reaction with o-phenylenediamine and o-aminothiophenol underwent chemo- and regioselective ring opening followed by intramolecular Michael type addition and 1,4-elimination reactions to furnish kinetically controlled products α-quinoxalinylacrylic acid (5) and α-benzothiazinylacrylic acid (6) in good yields.
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