[3 + 2] Cycloaddition of Isocyanides with Aryl Diazonium Salts: Catalyst-Dependent Regioselective Synthesis of 1,3- and 1,5-Disubstituted 1,2,4-Triazoles
作者:Jian-Quan Liu、Xuanyu Shen、Yihan Wang、Xiang-Shan Wang、Xihe Bi
DOI:10.1021/acs.orglett.8b03069
日期:2018.11.2
An unprecedented catalyst-dependent regioselective [3 + 2] cycloaddition of isocyanides with aryl diazonium salts is reported. 1,3-Disubstituted 1,2,4-triazoles were selectively obtained in high yield under Ag(I) catalysis, whereas 1,5-disubstituted 1,2,4-triazoles were formed by Cu(II) catalysis. These catalytic methodologies provide a controlled, modular, and facile access to 1,2,4-triazole scaffolds
据报道,前所未有的催化剂依赖性异氰酸酯与芳基重氮盐的区域选择性[3 + 2]环加成反应。在Ag(I)催化下,高收率选择性地获得了1,3-二取代的1,2,4-三唑,而在Cu(II)催化下形成了1,5-二取代的1,2,4-三唑。这些催化方法学提供了高效,宽泛的底物范围和出色的官能团相容性的1,2,4-三唑支架的受控,模块化和便捷操作。