A convenient transition metal-free procedure for the direct thiolation of 1,3,4-oxadiazole CâH bonds using diaryl disulfides has been developed. Other substrates including indole, benzothiazole, N-phenylbenzimidazole, and caffeine were also thiolated in this manner, providing the corresponding products in good to excellent yields.
A Cu(II)-catalyzed Csp 2 -Se and Csp 2 -Sulfur bondformation was achieved with moderate to good yields without the aid of Lewis acid and base. The reaction is compatible with a wide range of heterocycles such as benzothiazole, thiazole, and imidazole. Also, this typical protocol is found to be active in thio-selenation via S-H activation. Additionally, we proposed a plausible mechanistic pathway involving
Efficient formation of C–S bond using heterocyclic thiones and arynes
作者:Yu An、Gang Xu、Menglu Cai、Shihui Wang、Xiao zhong Wang、Yingqi Chen、Liyan Dai
DOI:10.1016/j.tet.2020.131829
日期:2021.1
their diverse biological activities and medicinal prospects. Here, a facile method was reported. An arylation of 1,3,4-oxa(thia)diazol-2-thiones reacting with arynes to build C(aryl)-S bonds in the presence of CsF had good yields and excellent selectivity. The reaction was completed in short time without using expensive reagents and catalysts. Present reaction system is an efficient procedure to process
A copper-catalyzed cross-coupling of heterocyclic thiols with aryliodides is reported. The reaction was carried out in the presence of CuI (5 mol %), 1,10-phenanthroline (10 mol %) and K2CO3 (1.3 equiv) in DMF at 120 °C. A variety of heterocyclic sulfides were prepared in high selectivities and yields.
据报道,铜催化的杂环硫醇与芳基碘化物的交叉偶联。反应在120℃下在CuI(5mol%),1,10-菲咯啉(10mol%)和K 2 CO 3(1.3当量)的存在下在DMF中进行。以高选择性和高产率制备了各种杂环硫化物。