An alternatively metal-free synthesis of 1,3,5-triazines or 1,2,4-thiadiazoles from benzyl chlorides and benzylamines mediated by elemental sulfur
作者:Yurong Zhang、Yafei Liu、Jun Zhang、Ren Gu、Shiqing Han
DOI:10.1016/j.tetlet.2019.151289
日期:2019.12
An elementalsulfur mediated reaction of benzyl chlorides with benzylamines is developed, which allows the practical synthesis of valuable 1,3,5-triazines. This protocol that is metal free, ligand free, and uses inexpensive elementalsulfur as oxidant or raw material displays mild reaction conditions, a broad substrate scope and moderate to good yields. Moreover, the modified sulfur-mediated reaction
A copper-catalyzed approach for the synthesis of asymmetrical disubstituted 1,2,4-thiadiazoles via elemental sulfur-mediated decarboxylative redox cyclization
作者:Yafei Liu、Yurong Zhang、Jun Zhang、Liang Hu、Shiqing Han
DOI:10.1016/j.tetlet.2020.152744
日期:2021.2
The variety of asymmetricaldisubstituted 1,2,4-thiadiazoles are smoothly prepared by copper-catalyzed approach, which employed arylacetic acids and amidines as substrates, and elemental sulfur to mediate decarboxylative redox cyclization. The advantages of this method are simple, efficient, and ligand-free. In addition, this method can provide products in moderate to good yields.