This reaction induces the cyclization of thiobenzanilides to benzothiazoles. The substrate absorbs visible light, and its excited state undergoes a reverse hydrogen-atom transfer (RHAT) with 2,2,6,6-tetramethylpiperidine N-oxyl to form a sulfur radical. The addition of the sulfur radical to the benzene ring gives an aryl radical, which then rearomatizes to benzothiazole via RHAT.
无需添加光敏剂,
金属催化剂或碱即可实现可见光驱动的分子内C(sp 2)–H
硫醇化。该反应诱导了
硫代苯甲酰胺环化为
苯并噻唑。底物吸收可见光,并且其激发态与
2,2,6,6-四甲基哌啶N-氧基发生反向氢原子转移(RHAT),形成
硫自由基。
硫自由基加到苯环上会得到一个芳基,然后再通过RHAT重新形成
苯并噻唑。