The synthesis and structural characterization of both diastereomers of 5′-(hydroxymethyl)-6,5′-cyclo-2′,5′-dideoxyuridine cyclonucleosides
作者:Hongchuan Yu、Mark K. Schlegel、Larry W. McLaughlin
DOI:10.1039/c4ra04784b
日期:——
A concise synthesis of both C5′ diastereomers of 5′-(hydroxymethyl)-6,5′-cyclo-2′,5′-dideoxyuridine is presented. Individual crystal structures of the fully deprotected S- and R-stereoisomers indicate that the addition of a methylene group between the C5′ and O5′ positions of 6,5′-cyclo-2′-deoxyuridine increases the distance between the nucleobase and backbone. The resulting nucleosides adopt a conformation
提出了5'-(羟甲基)-6,5'-环-2',5'-二脱氧尿苷的两个C5'非对映异构体的简明合成。完全脱保护的S-和R-立体异构体的单个晶体结构表明,在6,5'-cyclo-2'-脱氧尿苷的C5'和O5'位置之间添加亚甲基会增加核碱基与骨架之间的距离。所得核苷采用的构象更接近于模拟A型而不是B型核苷酸。5'(R的核苷酸)-((羟甲基)-6,5'-cyclo-2',5'-二脱氧尿苷在自动合成过程中成功整合到DNA寡核苷酸中,但是由于插入位点的碱基催化的链断裂。