Bulletin of the Chemical Society of Japan p. 3221 - 3222 (1981)
Update date:2022-08-05
Topics:
Kagaruki, Serry R. F.
Kitazume, Tomoya
Ishikawa, Nobuo
3-Alkyl(or aryl)-4-fluoro-5-hydroxypyrazoles and their 1-methyl derivatives were prepared by the reaction of methyl α-fluoro-β-alkyl(or aryl)-β-keto esters with hydrazine hydrate or methylhydrazine in ethanol.The reaction of arylhydrazines with α-fluoro-β-keto esters gave only hydrazones which could not be cyclized to pyrazoles.
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(1981)Doi:10.1016/j.tet.2004.07.103
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