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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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Paper | Regular issue | Vol 27, No. 7, 1988, pp.1697-1707
Published online, 1st January, 1970■ Synthesis of 3-Amino-4-benzoylsydnones
Published online, 1st January, 1970
DOI: 10.3987/COM-88-4568
■ Synthesis of 3-Amino-4-benzoylsydnones
Wilhelm Fleischhacker* and Ernst Urban
*Institute of Pharmaceutical Chemistry, University of Vienna, Währinger Strasse 10, A-1090 Vienna, Austria
Abstract
In a three step synthesis starting from ethyl hyarazinoacetate HCl (1), 3-benzylidenaminosydnone (4) was available in good yields. Reduction with sodium boranate gave 3-benzylaminosydnone (5a). Lithiation and electrophilic substitution of 5a was studied. Reacting lithiated 5a with N,N-dimethylbenzamide afforded 3-benzylamino-4-benzoylsydnone (5i) which could be deprotected to give 3-amino-4-benzoylsydnone (8b).
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