Synthesis of 4-Fluoromethylsydnones and their Participation in Alkyne Cycloaddition Reactions
作者:Robert S. Foster、Harry Adams、Harald Jakobi、Joseph P. A. Harrity
DOI:10.1021/jo400381a
日期:2013.4.19
We report the synthesis and some structural studies of 4-trifluoromethyl, 4-difluoromethyl-, and 4-monofluoromethylsydnones. All but the latter compounds are stable and represent effective precursors to a range of pyrazoles after cycloaddition reactions with alkynes. The cycloadditions are generally highly regioselective and provide 5-fluoromethylpyrazole products, although we have observed that Bn-substituted
我们报告了4-三氟甲基,4-二氟甲基-和4-单氟甲基sydnones的合成和一些结构研究。除后者以外的所有化合物都是稳定的,并且在与炔烃进行环加成反应后,代表了一系列吡唑的有效前体。尽管我们已经观察到Bn取代的sydnones可以提供意想不到的炔烃插入模式以生成3-氟甲基异构体,但是环加成物通常具有高度的区域选择性并提供5-氟甲基吡唑产物。