Synthesis and NMR-studies of dinucleotides with conformationally restricted cyclic phosphotriester linkages
作者:Anders M Sørensen、Katrine E Nielsen、Barbara Vogg、Jens Peter Jacobsen、Poul Nielsen
DOI:10.1016/s0040-4020(01)01047-x
日期:2001.12
Four diastereomeric dinucleotides in which the phosphodiester linkages are conformationally restricted in cyclic phosphotriester structures are synthesised. From the epimeric 5′-C-vinyl thymidine derivatives, dinucleotides containing two terminal alkene moieties are constructed via standard phosphoramidite chemistry, and applied as substrates in ring-closing metathesis (RCM) reactions. Hereby, four
合成了其中磷酸二酯键在环状磷酸三酯结构中构象受限的四个非对映异构二核苷酸。来自差向异构体5'- C-乙烯基胸苷衍生物,包含两个末端烯基部分的二核苷酸,是通过标准亚磷酰胺化学方法构建的,并用作闭环复分解(RCM)反应的底物。从而,获得并分离了在核苷间键中具有七个成员磷酸环的四个非对映异构二核苷酸,并通过先进的NMR研究结合受限的分子动力学(rMD)模拟阐明了它们的构型。发现七个成员环在天然核酸主链中提供一定程度的构象限制,并且发现四个二核苷酸之一有利于两个相邻的胸腺嘧啶部分之间的堆叠。