Conformational preferences of the pyrrolidine ring in nucleotide analogs 7–14 were investigated by means of NMR and molecular modeling. The effect of the relative configuration of hydroxy and nucleobase substituents as well as the effect of the alkylation or acylation of the pyrrolidine nitrogen atom on the conformation of the pyrrolidine ring were studied. The results of a conformational analysis show that the alkylation/acylation can be effectively used for tuning the pyrrolidine conformation over the whole pseudorotation cycle.
核苷酸类似物中吡咯烷环的构象偏好通过核磁共振和分子建模进行了研究。研究了羟基和核碱基取代基的相对构型以及吡咯烷氮原子的烷基化或酰化对吡咯烷环构象的影响。构象分析结果表明,烷基化/酰化可以有效地用于调节整个伪旋转周期中吡咯烷环的构象。