Recyclable copper-catalyzed cyclization of o-haloanilides and metal sulfides: An efficient and practical access to substituted benzothiazoles
作者:Mingzhong Cai、Qian Ye、Wencheng Huang、Wenyan Hao
DOI:10.1016/j.mcat.2022.112115
日期:2022.2
An efficient heterogeneous copper-catalyzed cyclization of o-haloanilides and metal sulfides has been achieved via the C–S coupling in DMF at 80 or 140 °C in the existence of an MCM-41-bound NHC-Cu(I) catalyst and then intramolecular condensation, delivering a wide range of substituted benzothiazoles in mostly good to high yields. This new MCM-41-NHC-CuI complex can facilely be obtained by a two-step
在 MCM-41 结合的 NHC-Cu(I) 催化剂存在下,通过 DMF 中的 C-S 偶联,在 80 或 140 °C 下实现了有效的多相铜催化的邻卤代苯胺和金属硫化物环化,然后分子内缩合,以良好至高产率提供范围广泛的取代苯并噻唑。这种新的 MCM-41-NHC-CuI 复合物可以通过两步程序轻松获得,从易于获得且价格低廉的试剂开始,并重复使用七次以上,而不会显着降低其催化效率。本协议已成功应用于两种抗肿瘤剂 5F203 和 PMX 610 的克级合成。