From imidates to vinyl-1,2,4-triazoles: Synthesis, mechanistic aspects and first issues of their reactivity
作者:Safa Azzouni、Abderrahmen Abdelli、Anne Gaucher、Youssef Arfaoui、Mohamed Lotfi Efrit、Damien Prim
DOI:10.1016/j.tet.2018.10.050
日期:2018.12
The method reveals selective towards 5-vinyl-1,2,4-triazoles avoiding the potential formation of seven- and five-membered side-products as supported by theoretical calculations and NMR experiments. First lines of Pd-catalyzed arylation of the vinyl fragment towards 5-styryl-1,2,4-triazoles and Cu-catalyzed arylation at the N(1) site are finally described.
各种取代的酰基酰亚胺与肼衍生物的反应代表了向5-乙烯基-1,2,4-三唑衍生物的有效且易于设定的合成入口。三唑环的结构允许在五元杂环的N(1),C(3)和C(5)位置以高至高收率安装各种取代基组合。该方法揭示了对5-乙烯基-1,2,4-三唑的选择性,避免了理论计算和NMR实验支持的七元和五元副产物的潜在形成。最后描述了在N(1)位点上Pd催化的乙烯基片段朝5-styryl-1,2,4-三唑的芳基化和Cu催化的芳基化的第一行。