Aryl and t‐butylhydrazines react with 2‐cyano‐3‐ethoxythiocrotonamide affording 2‐cyano‐3‐aryl‐t‐butylhy‐drazinothiocrotonamides. These intermediates can be easily cyclized to 4‐thiocarbamoyl‐5‐aminopyrazoles by heating a few minutes in a strong base. Alkylhydrazines react with 2‐cyano‐3‐ethoxythiocrotonamide yielding directly a mixture of the cyclized compounds 4‐cyano‐5‐aminopyrazoles and 4‐thiocarbamoyl‐5‐aminopyr‐azoles. Copyright © 1985 Journal of Heterocyclic Chemistry
Synthesis of 4‐thiocarbamoyl‐5‐aminopyrazoles
GIORI, Paolo;VERONESE, Augusto;VICENTINI, Chiara Beatrice;GUARNERI, Mario
1985
Abstract
Aryl and t‐butylhydrazines react with 2‐cyano‐3‐ethoxythiocrotonamide affording 2‐cyano‐3‐aryl‐t‐butylhy‐drazinothiocrotonamides. These intermediates can be easily cyclized to 4‐thiocarbamoyl‐5‐aminopyrazoles by heating a few minutes in a strong base. Alkylhydrazines react with 2‐cyano‐3‐ethoxythiocrotonamide yielding directly a mixture of the cyclized compounds 4‐cyano‐5‐aminopyrazoles and 4‐thiocarbamoyl‐5‐aminopyr‐azoles. Copyright © 1985 Journal of Heterocyclic ChemistryFile in questo prodotto:
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