Reactivity of substrates with multiple competitive reactive sites toward NBS under neat reaction conditions promoted by visible light
作者:Blaž Grjol、Marjan Jereb
DOI:10.1007/s11696-021-01711-x
日期:2021.10
methoxy groups, respectively. Surprisingly, ipso-substitution of the acyl group with a bromine atom took place with (4-methoxynaphthyl) alkyl ketones. While the addition of the radical scavenger TEMPO (2,2,6,6-tetramethylpiperidin-1-yloxy) decreased the extent of α- and ring bromination, it completely suppressed the benzylic bromination and α,α-dibromination with NBS under SFRC.
摘要在无溶剂反应条件下,研究了可见光诱导的一系列(杂)芳基烷基取代酮与 N-溴代琥珀酰亚胺 (NBS) 的区域选择性转化,这些酮具有多个竞争性反应位点(α-羰基、苄基和芳环)。 (SFRC) 并且在没有惰性气体气氛、自由基引发剂和催化剂的情况下。使用 8 W 节能家用灯进行照射。在整个研究过程中处理了多相反应条件。所有底物在 α-羰基位置均为单溴化或二溴化,此外,在具有苄基碳原子或给电子甲氧基的底物中分别观察到一些苄基或芳族溴化。令人惊讶的是,与(4-甲氧基萘基)烷基酮发生了用溴原子对酰基的原位取代。