An alternative preparation of pyrazolo-pyridine derivatives in ionic liquid and comparison study on the reactivity of thioamide and amide group.

[摘要]：An efficient prepn. of 4-aryl-6-amino-5-cyano-3-methyl-1-phenylpyrazolo[3,4-b]pyridines and 4-aryl-5-cyano-3-methyl-1-phenylpyrazolo[3,4-b]pyridin-6-ones from the condensation of arylidenecyanothioacetamide or -acetamide with 5-amino-3-methyl-1-phenylpyrazole in [bmim]BF4 is reported. The mechanism for the reaction and the comparison between the reactivity of thioamide vs. amide groups are briefly discussed.

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