Abstract The radical reaction of benzenethiol with alkynes 1a-o carried out at 154 °C affords a mixture of thiol/alkyne adduct 3 and benzothiophene 5, deriving from vinyl radical intermediates 2 through hydrogen abstraction and 5-(π-endo)orthocyclization onto the adjacent thiophenyl ring, respectively. This latter reaction occurs through the reversible formation of cyclohexadienyl radical intermediates
ortho-C–H activation of benzyl thioethers with alkynes under milder reaction conditions. The sulfur atom of benzyl thioethers worked as a directing group for ortho-C–H activation of benzyl thioethers. The reaction was found to tolerate a range of benzyl thioethers as well as alkynes. Moreover, the reaction is significantly influenced by the length of alkyl and arylthioethers, with the best results being
在本报告中,我们建立了 Ru(η 6 -C 6 H 6 )Cl 2 催化的邻位-C–H在较温和的反应条件下用炔烃活化苄基硫醚。苄基硫醚的硫原子作为苄基硫醚邻位C-H活化的导向基团。发现该反应可以耐受一系列苄基硫醚和炔烃。此外,该反应受到烷基和芳基硫醚长度的显着影响,使用苄基硫醚可获得最佳结果。动力学同位素实验表明,邻位C-H键断裂并不是本反应的速率决定步骤。在一个尚未报道的不寻常观察中,除了邻位C-H活化之外,在相同的反应条件下,仅用丙烯酸酯获得了选择性脱苄基硫氢化作用,这拓宽了苄基硫醚在制备混合硫族醚中的合成影响。