Reactivity of Bispropargyl Sulfones under Basic Conditions: Interplay Between Garratt-Braverman and Schmittel/Myers-Saito Cyclization Pathway
作者:Raja Mukherjee、Sayantan Mondal、Amit Basak、Dibyendu Mallick、Eluvathingal D. Jemmis
DOI:10.1002/asia.201100903
日期:2012.5
The preference for Garratt–Braverman (GB) over Myers–Saito (MS) and Schmittel (SCM) cyclizations has recently been demonstrated in sulfones capable of undergoing all three of the processes. As the GB cyclization is a self‐quenching process, there is a need to change the selectivity to the non‐self‐quenching MS or SCM pathway so as to enhance the DNA‐cleaving efficiency that operates through the radical‐mediated
最近,在能够经历所有这三个过程的砜中,证明了Garratt-Braverman(GB)优于Myers-Saito(MS)和Schmittel(SCM)环化反应。由于GB环化是一个自我猝灭过程,因此需要改变对非自我猝灭MS或SCM途径的选择性,以提高通过自由基介导的过程进行DNA切割的效率。在这里,我们报告通过使用计算(M06-2X / 6-31 + G *)开发的基于构象约束的策略,将选择性从GB转换为MS / SCM途径,这也导致更大的DNA裂解活性。可以通过使用垫片来减轻约束,从而恢复对GB的偏爱。