Preparation of Pyrazole and Pyrazoline Derivatives by Intramolecular Reaction of Hydrazones
作者:Jing-Kang Shen、Hajime Katayama
DOI:10.1246/cl.1992.451
日期:1992.3
Pyrazole and pyrazoline derivatives are prepared by the intramolecular cyclization reaction of a hydrazonyl group with formyl or keto groups in the presence of a Lewis acid.
Abstract A facile copper(I)-catalyzed tandem reaction for the synthesis of 4,5-dihydropyrazolo[1,5-a]quinolines and pyrazolo[1,5-a]indoles is reported here. High efficiency and good yields are displayed in this transformation under mild reaction conditions.