Regioselective Synthesis of 1,3,5-Trisubstituted Pyrazoles from <i>N</i>-Alkylated Tosylhydrazones and Terminal Alkynes
作者:Yuanfang Kong、Meng Tang、Yun Wang
DOI:10.1021/ol403447g
日期:2014.1.17
An efficient synthesis of 1,3,5-trisubstituted pyrazoles from N-alkylated tosylhydrazones and terminal alkynes was developed. The protocol was applied to a wide range of substrates and demonstrated excellent tolerance to a variety of substituents, including both electron-donating and -withdrawing groups. In comparison with the common approaches for substituted pyrazole syntheses, this methodology proceeded
开发了由N-烷基化的甲苯磺酰terminal和末端炔烃有效合成1,3,5-三取代的吡唑的方法。该规程适用于多种底物,并表现出对各种取代基(包括供电子基团和吸电子基团)的出色耐受性。与用于取代的吡唑合成的常规方法相比,该方法以完全的区域选择性进行,特别是在R 2和R 3是相似的取代基的情况下。