associates more strongly than the sequence‐isomeric U*[n]A* dinucleoside 19. The A*[n]U* dinucleosides 23 and 24 associate more strongly than the analogues devoid of the substituent at C(6/I), while the U*[n]A* dinucleoside 19 associates less strongly than the analogue devoid of the substituent at C(8/I). While 23 and 24 form cyclic duplexes mostly by Watson–Crick‐type base pairing, 25 only forms linear associates
自身互补
氨基亚甲基联A * [n]的U *二核苷23 - 26通过醛的还原偶联制备10和
叠氮化物8。在U * [n]的A *序列的异构体19 - 21类似地从醛制备14和
叠氮化物3。C(6 / I)为23 – 26和C(8 / I)为19 – 21的取代基强烈支持顺构构象。A * [n] U *二核苷23的缔合作用比序列异构的U *更强[n] A *二核苷19。的A * [n]的U *二核苷23和24准比更强烈的类似物缺乏在C(6 / I)的取代基的,而U * [n]的A *二核苷19个联营弱于的模拟无C(8 / I)上的取代基。而23和24形式的环状双链体大多由沃森-克里克型碱基配对,25只形成线性关联。U * [n] A *二核苷19主要形成线性双链体和更高的缔合体,而21形成循环双工,显示沃森–克里克和Hoogsteen型碱基配对。
氨基亚甲基连接的二核苷的环状双链体同时显示了接头的g