Metal-free and highly regioselective synthesis of N-heteroaryl substituted pyrazoles from α,β-unsaturated N-tosylhydrazones and heteroaryl chlorides
作者:Lin Zeng、Xiao-Qiang Guo、Zai-Jun Yang、Ya Gan、Lian-Mei Chen、Tai-Ran Kang
DOI:10.1016/j.tetlet.2019.07.034
日期:2019.8
β-unsaturated N-tosylhydrazones with N-heteroaryl chlorides was developed for the synthesis of N-heteroaryl pyrazole derivatives. This one-pot reaction provided bi(heteroaryl) derivatives in good to excellent yields and with excellent regioselectivity. The procedure is operationally simple and applicable to large-scale synthesis.
级联环化/亲核芳香取代(S Ñ AR)α的反应,β不饱和Ñ与-tosylhydrazones ñ -杂芳基氯化物被用于合成开发Ñ -杂芳基吡唑衍生物。该一锅法反应以良好的至优异的产率和优异的区域选择性提供了双(杂芳基)衍生物。该程序操作简单,适用于大规模合成。