Visible-light-driven copper-catalyzed aerobic oxidative cascade cyclization of <i>N</i>-tosylhydrazones and terminal alkynes: regioselective synthesis of 3-arylcoumarins
first example of sustainable, intuitive, highly regioselective, visible-light-driven copper catalyzed aerobic oxidative cascade cyclization of N-tosylhydrazones with terminal alkynes for the preparation of 3-arylcoumarins at room temperature. This operationally simple methodology has been successfully applied to a wide range of N-tosylhydrazones and alkynes (49 examples), and proceeds well to afford biologically
我们提出了可持续的,直观的,高度区域选择性的,可见光驱动的铜催化的N-甲苯磺酰with与末端炔烃的有氧氧化级联环化反应,以在室温下制备3-芳基香豆素。这种操作简单的方法已成功应用于各种N-甲苯磺酰hydr和炔烃(49个实例),并且进展顺利,可提供具有生物活性的化合物,例如单胺氧化酶B(MAO-B)抑制剂和辣根过氧化物酶(HRP)抑制剂,在温和的条件下具有令人满意的产量。此外,机理研究表明,反应是通过铜进行的(II18 O 2同位素标记实验证明)-超氧或-过氧配合物介导的末端炔烃的氧化环化反应。
KOLODYAZHNYJ, O. I.;GRISHKUN, E. V.;YAKOVLEV, V. I.;KUXAR, V. P., ZH. OBSHCH. XIMII, 60,(1990) N, S. 1050-1053
作者:KOLODYAZHNYJ, O. I.、GRISHKUN, E. V.、YAKOVLEV, V. I.、KUXAR, V. P.