Copper-Promoted Coupling of Propiophenones and Arylhydrazines for the Synthesis of 1,3-Diarylpyrazoles

Abstract Synthesis of 1,3-diarylpyrazoles from commercial substrates and/or simple transformations is still underrated. In this report, we have developed a method for copper-promoted coupling of propiophenones and arylhydrazines. The reactions afforded substituted pyrazoles in the presence of TEMPO...

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Bibliographic Details
Published in:Synlett 2020-05, Vol.31 (8), p.801-804
Main Authors: Pham, Thuyet L. D., Nguyen, Tien M., Tran, Khuong A., Dang, Ha V., Phan, Nam T. S., Le, Ha V., Nguyen, Tung T.
Format: Article
Language:English
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Summary:Abstract Synthesis of 1,3-diarylpyrazoles from commercial substrates and/or simple transformations is still underrated. In this report, we have developed a method for copper-promoted coupling of propiophenones and arylhydrazines. The reactions afforded substituted pyrazoles in the presence of TEMPO oxidant, acetic acid additive, and DMF solvent. A number of functionalities were compatible with reaction conditions, including halogens, methoxy, trifluoromethyl, and nitro groups. An indazole could be obtained if an electron-poor propiophenone was used.
ISSN:0936-5214
1437-2096
DOI:10.1055/s-0039-1690835