Generation of Dimethyl Sulfoxide Coordinated Thermally Stable Halogen Cation Pools for C−H Halogenation
作者:Pallaba Ganjan Dalai、Kuntal Palit、Niranjan Panda
DOI:10.1002/adsc.202101291
日期:2022.3
A method to generate halogen cation pools from the reaction of 1,2-dihaloethanes (hal=Br, I) and dimethyl sulfoxide (DMSO) for C−H halogenation of arenes and heteroarenes was reported. The initial reaction of DMSO and 1,2-dihaloethane generates the sulfur ylide, which undergoes pyrolytic elimination of ethylene by affording halonium ions. These ions were accumulated and stabilized by DMSO through coordination
报道了一种通过 1,2-二卤代乙烷 (hal=Br, I) 和二甲基亚砜 (DMSO) 的反应生成卤素阳离子池的方法,用于芳烃和杂芳烃的 C-H 卤化。DMSO 和 1,2-二卤代乙烷的初始反应生成硫叶立德,其通过提供卤离子来热解消除乙烯。DMSO 通过配位形成卤化反应的卤离子池,从而积累和稳定这些离子。该方案在室温下对芳烃的亲电单卤化具有选择性;但是,通过提高反应温度会形成多卤代产物。杂芳烃和一些常用药物的后期卤化表明该协议在药物化学中的合成效用。与经典方法不同,