1-(2′-Deoxy-β-<scp>D</scp>-xylofuranosyl)cytosine: Base pairing of oligonucleotides with a configurationally altered sugar-phosphate backbone
作者:Frank Seela、Karlheinz Wörner、Helmut Rosemeyer
DOI:10.1002/hlca.19940770402
日期:1994.6.29
Solid-phase synthesis of the oligo(2′-deoxynucleotides) 19 and 20 containing 2′-deoxy-β-D-xylocytidine (4) is described. For this purpose, 1-(2-deoxy-β-D-threo-pentofuranosyl)cytosine ( = 1-(2-deoxy-β-D-xylofuranosyl)-cytosine; 4) was protected at its 4-NH2 group with a benzoyl ( 5) or an isobutyryl (8) residue, and a dimethoxytrityl group was introduced at 5′-OH ( 7, 10; Scheme 2). Compounds 7 and 10 were
描述了固相合成包含2'-脱氧-β-D-二氧胞嘧啶核苷(4)的寡聚(2'-脱氧核苷酸)19和20。为此目的,将1-(2-脱氧-β-D-苏-戊呋喃糖基)胞嘧啶(= 1-(2-脱氧-β-D-木呋喃糖基)-胞嘧啶;4)在其4-NH 2基团上被保护。在5'-OH处引入苯甲酰基(5)或异丁酰基(8)残基和二甲氧基三苯甲基(7、10;方案2)。化合物7和10被转化为3'-膦酸酯11a,b。虽然19可以与21和22杂交,形成双链体,两个末端均带有两个核苷酸突出端(19·21:T m 29°;19·22:T m 22°),带有四个xC d残基的decamer 20不能不再与相反链之一杂交。此外,寡核苷酸d [(xC)8 C](13),d [(xC)4 C](14),d [C(xC)4 C](15)和d [C(xC)3 C合成(16)。虽然13与d(C 9)(17)相比,其CD谱图几乎反转,其他寡核苷酸则显示常规右旋单螺旋典型的CD谱图。在pH