A New Route for the Preparation of Pyrazolo[4,3-<I>c</I>]pyridines
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概要
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The anhydride (II) of 4-carboxy-1,5-diphenylpyrazole-3-acetic acid (I) has been prepared. The reactions of II with primary amines resulted in the formation of the monoamides IIIa–c. 2,3-Diphenylpyrazolo[4,3-<I>c</I>]pyridine-(5<I>H</I>,7<I>H</I>)-4,6-dione (VIIa), has been obtained by heating the ammonium salt of I in a vacuum at 220 °C. The ring closure of IIIc with acetyl chloride in benzene afforded VIIb. Compound VIIb was coupled with benzenediazonium chloride to give the 7-phenylazo derivative (XII) and also condensed with aromatic aldehydes giving 7-arylidene derivatives (XV).
- 公益社団法人 日本化学会の論文
著者
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El-sayed Abdou
Department of Chemistry, Faculty of Science, Tokyo Institute of Technology
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Ohta Masaki
Department of Chemistry, Faculty of Science, Tokyo Institute of Technology
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