期刊
RSC ADVANCES
卷 7, 期 45, 页码 28483-28488出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ra04336h
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-
资金
- Universidad de los Andes and Colombian Institute for Science and Research (COLCIENCIAS)
Herein, a regioselective, time-efficient and one-pot route for the synthesis of diversely substituted 3-haloand 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 beta-enaminones with NH-5aminopyrazoles, 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%.
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