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題名 | Studies on the Synthesis of New 3-(3,5-Diamino-1-substituted-pyrazol-4-yl)azo-thieno[2,3-b]pyridines and 3-(2-Amino-5,7-disubstituted-pyrazolo[1,5-a]pyrimidine-3-yl)azothieno[2,3-b]pyridines |
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作 者 | 何玉文; | 書刊名 | Journal of the Chinese Chemical Society |
卷期 | 46:6 1999.12[民88.12] |
頁次 | 頁955-962 |
分類號 | 346.01 |
關鍵詞 | 吡唑; Pyrazoles; Pyrazolo[1,5-a]pyrimidines; 3-Amino-2-cyano-thieno[2,3-b]pyridine; |
語文 | 英文(English) |
英文摘要 | Coupling the diazonium salt of 3-amino-2-cyano-4,6-dimethylthieno[2,3- b]pyridine 1 with malononi trile 2 gave 2-cyano-3-(hydrazonomalononitrile)-4,6- dimethylthieno[2,3-b]pyridine 3 which then reacted with hydrazine compounds 4a-4h to yield corresponding 2-cyano-3-(3,5-diamino-1-substituted-pyrazol-4-yl)azo- 4,6-dimethylthieno[2,3-b]pyridines 5a-5h. The 2-cyano-3-(2-amino-5,7- disubstituted-pyrazolo-[1,5-a]pyrimidine-3-yl)azo-4,6-dimethylthieno[2,3- b]pyridines 7a-7f were obtained in good yield by the cyclocondensation reaction of 2-cyano-3-(3,5-diamino-pyrazol-4-yl)azo-4,6-dimethylthieno[2,3-b]pyridine 5a with the appropriate 1,3-diketones 6a-6f under acidic condition. |
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