Nickel-Catalyzed Difunctionalization of Alkynyl Bromides with Thiosulfonates and N-Arylthio Succinimides: A Convenient Synthesis of 1,2-Thiosulfonylethenes and 1,1-Dithioethenes
作者:Raju Jannapu Reddy、Arram Haritha Kumari、Jangam Jagadesh Kumar、Gamidi Rama Krishna
DOI:10.1055/a-1482-2486
日期:2021.8
cesium carbonate is described. An operationally simple and highly regioselective atom transfer radical addition (ATRA) of alkynyl bromides provides a wide range of (E)-1,2-thiosulfonylethenes (α-aryl-β-thioarylvinyl sulfones) in moderate to high yields. The extensive substrate scope of both alkynyl bromides and thiosulfonates is explored with a broad range of functional groups. Indole-derived 1,1-bromoalkenes
描述了在碳酸铯存在下用硫代磺酸盐有效地催化1-溴炔烃的镍催化邻位硫磺酰化。炔基溴化物的操作简单且高度区域选择性的原子转移自由基加成(ATRA),可提供中等至高收率的多种(E)-1,2-硫代磺酰基(α-芳基-β-硫代芳基乙烯基砜)。炔基溴化物和硫代磺酸盐的底物范围广泛,具有广泛的官能团。在此1,2-硫磺酰化过程中,还成功地探索了吲哚衍生的1,1-溴代烯烃。而且,炔基溴化物与N-芳硫基琥珀酰亚胺的镍催化的双-二硫代化以高收率提供了1,1-二硫代烯烃。本协议在克级上是可靠的,并在大规模合成中实现了苯乙炔的顺序一锅法溴化和硫磺酰化。在对照实验之后,提出了合理的机制来合理化实验结果和邻近的硫磺酰化反应。