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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 31, No. 10, 1990, pp.1855-1860
Published online, 1st January, 1970■ Studies on Isonitriles and Related Compounds. Synthesis of 1H-Pyrrole and 1H-Imidazole Derivatives via 1,3-Dipolar Cycloaddition
Published online, 1st January, 1970
DOI: 10.3987/COM-90-5529
■ Studies on Isonitriles and Related Compounds. Synthesis of 1H-Pyrrole and 1H-Imidazole Derivatives via 1,3-Dipolar Cycloaddition
Ricardo Bossio, Stefano Marcaccini,* Paola Paoli, Roberto Pepino, and Cecilia Polo
*CNR, Centro di Studio Sulla Chimica e la Struttura dei Composti Eterociclici e lolo Applicazioni, c/o Dipartimento di Chimica Organica "Ugo Schiff", Università di Firenze, Via Gino Capponi 9, I-50121 Firenze, Italy
Abstract
4-Nitrobenzyl isocyanide (1) reacted with arylsulfenyl chlorides (2) to give isothiocarbamoyl chlorides (3). Treatment of 3 with NEt3 afforded nitrile ylides (4) which reacted with stoichiometric amounts of dimethyl acetylenedicarboxylate to give 1H-pyrroles (5) and with an excess of the same reagnent to give dimethyl-2-substituted maleates (7). The reaction of 4 with ethyl cyanoformate afforded 1H-imidazoles (6).
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