Thio- and seleno-α,β- and α,β,γ-CNA (Constrained Nucleic Acid) dinucleotides in which two or three torsional angles of the sugar/phosphate backbone are controlled within a dioxaphosphorinane structure have been prepared. Their structural determination have been carried out by means of NMR to show only slight variation on the torsional angle control in comparison with their oxo analogues. Unexpected
已经制备了
硫代-和
硒-α,β-和α,β,γ-CNA(受限核酸)二核苷酸,其中糖/
磷酸骨架的两个或三个扭转角被控制在二氧杂膦烷结构内。它们的结构测定是通过 NMR 进行的,与它们的氧代类似物相比,扭转角控制只有轻微的变化。已经指出了
硒从
硒代
磷酸三酯部分到亚
磷酰胺基团的意外
硒迁移,但是使用 H-
膦酸酯
化学可以克服这个缺点。