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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 106, No. 4, 2023, pp.716-724
Published online, 10th March, 2023■ A Convenient Synthesis of 5-Trifluoromethyl-5-cyclopropyl-Substituted Pyrazolines
Published online, 10th March, 2023
DOI: 10.3987/COM-23-14815
■ A Convenient Synthesis of 5-Trifluoromethyl-5-cyclopropyl-Substituted Pyrazolines
Yong-Bin Xie, Xiao-Dong Liu, Ming-Xu Zhang, Wen-Bo Chen,* Chun-Hui Xing,* and Long Lu*
*CAS Key Laboratory of Energy Regulation Materials, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, 200032 Shanghai, China
Abstract
A new method for the preparation of 5-trifluoromethyl-5-cyclopropylpyrazoline derivatives via cesium hydroxide mediated condensation reaction of ꞵ-trifluoromethyl-ꞵ-cyclopropyl-substituted unsaturated ketones with hydrazines was reported. The approach featuring mild reaction conditions, broad substrates scope and good functional group tolerance, provided a strategy to synthesize new functionalized pyrazolines bearing both trifluoromethyl and cyclopropyl groups.
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