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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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Short Paper | Regular issue | Vol 87, No. 11, 2013, pp.2343-2350
Published online, 3rd October, 2013
Published online, 3rd October, 2013
DOI: 10.3987/COM-13-12822
■ Synthesis of Some Pyrazole-Fused Pyrido[3,2-a]azulenes
Dao-Lin Wang,* Zhe Dong, Qing-Tao Cui, Fei-Fei Yang, and Wei Zhao
*Liaoning Key Laboratory of Synthesis and Application of Functional Compound, College of Chemistry & Chemical Engineering, Bohai University, Jinzhou 121001, China
Abstract
Facile synthesis of 11H(2H)-4-oxopyrazolo[3’,4’:6,5]pyrido[3,2-a]azulene-10-carboxylates (3) via a domino reaction of 3-(dimethylamino)-2-(2-methoxy-1-ethoxycarbonylazulen-3-oyl)acrylonitrile (1) with hydrazines (2) in moderate to good yields. This reaction provides a new procedure for synthesis of pyridinone-fused azulenes.
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