Metal-Free Synthesis of Pyrazoles from 1,3-Diarylpropenes and Hydrazines <i>via</i>
Multiple Inter-/Intramolecular C-H Aminations
作者:Li Tang、Minyan Ma、Qi Zhang、Huan Luo、Tao Wang、Yonghai Chai
DOI:10.1002/adsc.201700196
日期:2017.8.7
A facile and metal‐free access to pyrazoles from 1,3‐diarylpropenes and hydrazines via multiple inter‐/intramolecular C‐H aminations was described. Under the neutral and mild 2,3‐dichloro‐5,6‐dicyanobenzoquinone (DDQ) oxidative conditions, various disubstituted pyrazoles were synthesized in moderate to excellent yields. This method provides a pot‐ and step‐economic strategy for the construction of
描述了通过多个分子间/分子间CH键胺从1,3-二芳基丙烯和肼中容易并无金属地获得吡唑的方法。在中性和温和的2,3-二氯-5,6-二氰基苯并醌(DDQ)氧化条件下,合成了各种二取代的吡唑,产率中等至优异。该方法为吡唑的构建,特别是用于药物发现的吡唑,提供了适当的,逐步的经济策略。