Studies on the Azaindolizine Compounds. X. Synthesis of 5, 7-Disubstituted Pyrazolo [1, 5-a] pyrimidines
Condensation of 1, 3-dicarbonyl compounds with 5-aminopyrazole (III) and its 3-carboxylic ester (X) was examined and several kinds of 5, 7-disubstituted pyrazolo [1, 5-a]-pyrimidines were obtained. It was observed by the infrared spectrum that the hydroxyl group at 5- and 7-positions of pyrazolo [1,...
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| Veröffentlicht in: | Chemical & pharmaceutical bulletin 1962/07/25, Vol.10(7), pp.612-620 |
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| Format: | Artikel |
| Sprache: | eng |
| Online-Zugang: | Volltext |
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| Zusammenfassung: | Condensation of 1, 3-dicarbonyl compounds with 5-aminopyrazole (III) and its 3-carboxylic ester (X) was examined and several kinds of 5, 7-disubstituted pyrazolo [1, 5-a]-pyrimidines were obtained. It was observed by the infrared spectrum that the hydroxyl group at 5- and 7-positions of pyrazolo [1, 5-a] pyrimidine ring shows the lactam form in the neutral medium |
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| ISSN: | 0009-2363 1347-5223 |
| DOI: | 10.1248/cpb.10.612 |