An interesting competition between 6π-electro- and Garratt–Braverman cyclization in bis-diene-allene sulfones: synergy between experiment and theory
作者:Sayantan Mondal、Amit Basak、Saibal Jana、Anakuthil Anoop
DOI:10.1016/j.tet.2012.06.001
日期:2012.9
The reactivity of a series of bispropargyl sulfones with an ortho alkenyl moiety was studied. Under basic condition, these molecules isomerized to the bis-diene-allene system capable of undergoing 6π-electro-(EC) as well as Garratt–Braverman (GB) cyclization. The reaction generally favours the GB process but the balance can be tilted towards the 6π-EC pathway by suitable perturbation of structure and
研究了一系列双炔丙基砜与邻链烯基部分的反应性。在碱性条件下,这些分子异构化成双二烯-丙二烯系统,能够进行6π-电-(EC)以及Garratt-Braverman(GB)环化。该反应通常有利于GB过程,但是通过适当的结构和温度扰动,平衡可以向6π-EC途径倾斜。该发现很有用,因为经历GB途径的系统可以显示DNA损伤活性。