4-Amino-1-arylpyrazole durchThorpe-Cyclisierung |
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| Authors: | Doz. Dr. Karl Gewald Osmar Calderon |
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| Affiliation: | (1) Sektion Chemie, Technische Universität Dresden, Mommsenstraße 13, DDR-8027 Dresden, Deutsche Demokratische Republik |
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| Abstract: |  -Arylhydrazononitriles1 react with -halogen carbonyl compounds in presence of K2CO3 to yield substituted4-amino-1-aryl-pyrazoles3. Pyrazolo[4,3-d]pyrimidines, pyrazolo[4,3-d]oxazinones and substituted 4-aminopyrazolecarboxylic acids can be obtained from3; the carboxyl group in the 5-position can be removed. |
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