Herein, a regioselective, time-efficient and one-pot route for the synthesis of diversely substituted 3-halo- and 3-nitropyrazolo[1,5-a]pyrimidines in good to excellent yields through a microwave-assisted process is provided. The reaction features a sequential cyclocondensation reaction of β-enaminones with NH-5-aminopyrazoles, followed by a regioselective electrophilic substitution with easily available electrophilic reagents. This methodology is distinguished by its short reaction times, high-yield, operational simplicity, broad substrate scope and pot-economy. Furthermore, these 3-functionalized heterocycles have been successfully used in the synthesis of 3-alkynyl and 3-aminopyrazolo[1,5-a]pyrimidines in yields up to 92%.

中文翻译：

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通过一锅法 简单地获得3-卤代和3-硝基吡唑并[1,5- a ]嘧啶†

在此，提供了一种区域选择性，省时和单反应路线，用于通过微波辅助方法以良好至优异的产率合成不同取代的3-卤代和3-硝基吡唑并[1,5- a ]嘧啶。该反应的特征在于β-烯酮与NH-5-氨基吡唑的顺序环缩合反应，然后用容易获得的亲电试剂进行区域选择性亲电取代。该方法的特点是反应时间短，产率高，操作简便，底物范围广和适用范围广。此外，这些3-官能化的杂环已成功地用于合成3-炔基和3-氨基吡唑并[1,5- a ]嘧啶，产率高达92％。