pH-Independent triplex formation: hairpin DNA containing isoguanine or 9-deaza-9-propynylguanine in place of protonated cytosine
作者:Frank Seela、Khalil I. Shaikh
DOI:10.1039/b610930f
日期:——
(2), 7-bromo-7-deaza-2'-deoxyisoguanosine (2) as well as the propynylated 9-deazaguanine N7-(2'-deoxyribonucleoside) were prepared. For this the phosphoramidites 9a, b of the nucleoside 1 and, the phosphoramidites 19, 20 of compound 3b were synthesized. They were employed in solid-phase oligonucleotide synthesis to yield the protected 31-mer oligonucleotides. The deblocking of the allyl-protected oligonucleotides
制备了包含2'-脱氧异鸟苷(2),7-溴-7-脱氮基2'-脱氧异鸟苷(2)以及丙烯酰化的9-脱氮鸟嘌呤N7-(2'-脱氧核糖核苷)的三链体形成寡核苷酸(TFO)。为此,合成了核苷1的亚磷酰胺9a,b以及化合物3b的亚磷酰胺19、20。它们被用于固相寡核苷酸合成中以产生受保护的31聚体寡核苷酸。通过Pd(0)[PPh3] 4-PPh3,然后用25%aq。水溶液进行含1的烯丙基保护的寡核苷酸的解封闭。NH3。通过紫外熔融曲线分析研究了31聚体单链分子内三链体的形成。在单链31-mer寡核苷酸中,dCH(+)-dG-dC基础三联体中的质子化dC被2'-脱氧异鸟苷(1),7-bromo-7-deaza-2'取代 -deoxyisoguanosine(2)和9-deaza-9-propynylguanine N7-(2'-deoxyribonucleoside)(3b)。用化合物1和3b取代质子化的