作者:Anu Naik、Jawad Alzeer、Therese Triemer、Anna Bujalska、Nathan W. Luedtke
DOI:10.1002/anie.201702554
日期:2017.8.28
A new method for the post‐synthetic modification of nucleic acids was developed that involves mixing a phenyl triazolinedione (PTAD) derivative with DNA containing a vinyl nucleobase. The resulting reactions proceeded through step‐wise mechanisms, giving either a formal [4+2] cycloaddition product, or, depending on the context of nucleobase, PTAD addition along with solvent trapping to give a secondary
已开发出一种新的核酸合成后修饰方法,该方法涉及将苯基三唑啉二酮(PTAD)衍生物与含有乙烯基核碱基的DNA混合。最终的反应通过逐步机制进行,给出了正式的[4 + 2]环加成产物,或者取决于核碱基的情况,还添加了PTAD以及溶剂捕集,从而在水中形成仲醇。PTAD与5-乙烯基-2'-脱氧尿苷(VdU)的末端烯烃之间的无催化剂加成异常快,其二级速率常数为2×10 3 m -1 s -1。PTAD衍生物以构象选择性的方式与含VdU的寡核苷酸选择性反应,与双链体DNA相比,G-四链体的收率更高。这些结果证明了DNA无铜生物缀合的新策略,可用于探测细胞中的核酸构象。