Translocation versus cyclisation in radicals derived from N-3-alkenyl trichloroacetamides
作者:M. Luisa Marin、Ramon J. Zaragoza、Miguel A. Miranda、Faïza Diaba、Josep Bonjoch
DOI:10.1039/c0ob01228a
日期:——
Under radical reaction conditions, two different and competitive reaction pathways were observed for N-(α-methylbenzyl)trichloroacetamides with a N-3-cyclohexenyl substituent: 1,4-hydrogen translocation and radical addition to a double bond. However, for radicals with an acyclic alkenyl side chain, the direct cyclisation process was exclusively observed. The dichotomy between translocation and direct radical cyclisation in these substrates has been theoretically studied using density functional theory (DFT) methods at the B3LYP/6-31G** computational level.
在自由基反应条件下,观察到带有 N-3-环己烯取代基的 N-(α-甲基苄基)三氯乙酰胺具有两种不同的竞争性反应途径:1,4-氢易位和双键的自由基加成。然而,对于带有无环烯基侧链的自由基,只能观察到直接环化过程。我们采用密度泛函理论(DFT)方法,在 B3LYP/6-31G** 计算水平上对这些基质中的易位和直接自由基环化二分法进行了理论研究。