A novel catalytic system based on covalently modified DNA is described. This catalyst promotes 1,3-dipolar reactions between azomethine ylides and maleimides. The catalytic system is based on the distortion of the double helix of DNA by means of the formation of Pt(II) adducts with guanine units. This distortion, similar to that generated in the interaction of DNA with platinum chemotherapeutic drugs
描述了一种基于共价修饰的DNA的新型催化系统。该催化剂促进了甲
亚胺烷基化物和马来
酰亚胺之间的1,3-偶极反应。催化系统基于DNA的双螺旋的变形,该结构是通过形成带有
鸟嘌呤单元的Pt(II)加合物来实现的。这种畸变类似于DNA与
铂化学治疗药物相互作用中产生的畸变,产生了可以容纳N-
金属化的偶氮甲
亚胺酰化物的活性位点。所提出的反应机理,基于QM(DFT)/ MM的计算,是与通向外消旋只形成热允许一致(但异步)[π4s+π2s]机制兼容内切-cycloadducts。