Synthesis and structural determination of 5-arylamino-1,3-dimethylpyrazoles |
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Authors: | V N Britsun I M Bazavova V N Bodnar A N Chernega M O Lozinskii |
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Institution: | (1) Institute of Organic Chemistry, Ukraine National Academy of Sciences, Kiev, 02094 |
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Abstract: | Treatment of 4-arylamino-4-thioxo-2-butanones with methylhydrazine in acetic acid gives 5-arylamino-1,3-dimethylpyrazoles which are readily halogenated in the 4 position. The thermal decomposition of 3-anilino-1,2,5-trimethyl-1H-pyrazolium chloride gives 1,3-dimethyl-5-phenylaminopyrazole and 1,5-dimethyl-3-phenylaminopyrazole in the approximate ratio of 1:1.__________Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 1, pp. 120–126, January, 2005. |
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Keywords: | 4-arylamino-4-thioxo-2-butanone 5-arylamino-1 3-dimethylpyrazoles 1 5-dimethyl-3-phenylaminopyrazole methylhydrazine |
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