中文摘要：

5-amino-4-cyano-3-substituted-1H-pyrazole 的冷凝作用反应 2 或 3 与 enaminones， 1 面对冰川的醋酸给了 12 新 7-aryl-3-cyano-2-substituted pyrazolo [1,5-a ] 嘧啶 4 和 5 在房间温度。他们的结构被元素的分析，红外和 1H NMR 描绘。4a 的结构被 X 光检查晶体学分析进一步证实。为标题混合物的形成的嘴巧的反应机制也被建议。生物鉴定测试证明混合物 4a， 4c， 4e， 4f， 5a 和 5d 拥有了中等 herbicidal 活动。

英文摘要：

The condensation reactions of 5-amino-4-cyano-3-substituted-1H-pyrazole 2 or 3 with enaminones 1 in the presence of glacial acetic acid gave twelve new 7-aryl-3-cyano-2-substituted pyrazolo[1,5-a]pyrimidines 4 and 5 at room temperature. Their structures were characterized by elemental analysis, IR and 1H NMR. The structure of 4a was further confirmed by X-ray crystallography analysis. A plausible reaction mechanism for the formation of the title compounds was also proposed. The bioassay tests showed that compounds 4a, 4e, 4e, 4f, 5a and 5d possessed moderate herbicidal activity.