Visible-light promoted one-pot synthesis of pyrazoles from alkynes and hydrazines
作者:Yunge Meng、Te Zhang、Xinchi Gong、Min Zhang、Chunyin Zhu
DOI:10.1016/j.tetlet.2018.12.009
日期:2019.1
A visible-light promoted cascade of Glaser coupling/annulation has been developed for one-pot synthesis of polysubstituted pyrazoles from alkynes and hydrazines. The method features mild reaction conditions, readily availible starting materials and green oxidant (O2). It works for a wide range of substituted phenyl acetylene and hyrazines with good functional group tolerance and efficiency. Mechanistic
已经开发了可见光促进的Glaser偶联/环化级联,用于从炔烃和肼一锅合成多取代的吡唑。该方法具有温和的反应条件,易于获得的起始原料和绿色氧化剂(O 2)。它可用于各种取代的苯基乙炔和肼,具有良好的官能团耐受性和效率。提出了包括光化学辐照,分子内氢原子吸收(HAT)和烯胺至亚胺互变异构在内的机理途径。