Highly selective and efficient synthesis of 3-arylamino-substituted 5-aminopyrazole-4-carboxylates under microwave irradiation
作者:Felicia Phei Lin Lim、Rowena Xin Yi Gan、Anton V. Dolzhenko
DOI:10.1016/j.tetlet.2017.01.028
日期:2017.2
An improved microwave-assisted method was developed for the preparation of ethyl 5-aminopyrazole carboxylates from ethyl 2-cyano-3-methylthioacrylates and hydrazine. It was shown that using microwave irradiation significantly reduced the reaction time and improved the process selectivity and yield. The reaction proved to be reproducible in different microwave reactors and on large scale, affording
开发了一种改进的微波辅助方法,用于从2-氰基-3-甲基硫代丙烯酸乙酯和肼制备5-氨基吡唑甲酸乙酯。结果表明,使用微波辐照显着减少了反应时间并提高了工艺选择性和收率。事实证明该反应在不同的微波反应器中可大规模再现,以高收率和纯度提供所需的产物。3-芳基氨基取代的5-氨基吡唑-4-羧酸盐的代表性文库已成功制备,以评估该方法的范围。