THE SYNTHESIS OF<i>ANTI</i>-FIXED 3-METHYL-3- DEAZA-2′-DEOXYADENOSINE AND OTHER 3<i>H</i>-IMIDAZO[4,5-c]PYRIDINE ANALOGS
作者:Rostem J. Irani、John SantaLucia
DOI:10.1081/ncn-120016477
日期:2002.12.31
syn and anti conformations in nucleosides. The syn conformation has been observed primarily in purine-purine mismatches in DNA duplexes. Such mismatches give rise to false positive oligonucleotide hybridization in DNA-based diagnostics. Here we describe the synthesis of an analog of 2'-deoxyadenosine that retains its Watson-Crick functional groups, but cannot form the syn conformation. In this analog
围绕糖苷键的杂环碱基的旋转允许在核苷中形成顺式和反式构象。主要在DNA双链体中的嘌呤-嘌呤错配中观察到了顺式构象。这样的错配在基于DNA的诊断中引起假阳性寡核苷酸杂交。在这里,我们描述了2'-脱氧腺苷类似物的合成,该类似物保留了其Watson-Crick官能团,但不能形成syn构象。在该类似物中,2'-脱氧腺苷的N3原子被C-CH3基团取代,得到7-甲基-1-β-D-脱氧呋喃核糖基-1H-咪唑并[4,5-c]吡啶-4-基胺或3-甲基-3-deaza-2'-脱氧腺苷(3mddA)。这种修饰在空间上阻止了顺式构象,并且3mddA成为2'-脱氧腺苷的抗固定核苷类似物。