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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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Paper | Regular issue | Vol 71, No. 8, 2007, pp.1755-1763
Published online, 22nd May, 2007■ Synthesis of 2-Aryl-2H-indazoles via Copper(I)-Catalyzed Intramolecular Amination Reaction
Published online, 22nd May, 2007
DOI: 10.3987/COM-07-11058
■ Synthesis of 2-Aryl-2H-indazoles via Copper(I)-Catalyzed Intramolecular Amination Reaction
Rui Liu, Yong-ming Zhu,* Lie-na Qin, Shun-jun Ji, and Hajime Katayama
*College of Pharmacy, Soochow University, Suzhou 215123, China
Abstract
A versatile method for the preparation of 2-aryl-2H-indazoles was developed by copper(I)-catalyzed intramolecular amination reaction under the conditions of [CuI/Cs2CO3(250mol%)/1,4-dioxane/105 °C] starting from N’-aryl -N’-(o-bromobenzyl)acetylhydrazines. The method was applied to a wide scope of substrates and afforded indazole products in high yields.
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