Oligonucleotide Analogues with Integrated Bases and Backbone. Part 13
作者:Xiaomin Zhang、Bruno Bernet、Andrea Vasella
DOI:10.1002/hlca.200690259
日期:2006.12
The self-complementary UA and AU dinucleotide analogues 41–45, 47, 48, and 51–60 were prepared by Sonogashira coupling of 6-iodouridines with C(5′)-ethynylated adenosines and of 8-iodoadenosines with C(5′)-ethynylated uridines. The dinucleotide analogues associate in CDCl3 solution. The C(6/I)-unsubstituted AU dimers 51 and 54 prefer an anti-oriented uracilyl group and form stretched linear duplexes
自身互补UA和AU二核苷酸类似物41 - 45,47,48,和51 - 60通过制备的Sonogashira与6- iodouridines耦合C(5') -ethynylated腺苷和与8- iodoadenosines C(5') -乙炔化尿苷。二核苷酸类似物在CDCl 3溶液中缔合。的C(6 / I) -未被取代的AU二聚体51和54更喜欢抗拉伸线性双链体取向uracilyl组和形式。UA炔丙醇41和43 – 45具有持久的分子内O(5'/ I)H⋅⋅⋅N(3 / I)H-键,因此,一个顺式取向的腺嘌呤基和GT -或TG取向乙炔基部分; 它们形成波纹状线性双工。所有其他的二聚体形成特征的循环复式顺式取向的核碱基。乙炔基部分的首选方向(C(4'),C(5')扭转角)定义了gg和乙炔基超过O(4'/ I)的构象。所述UA二聚体42,47,和48形式的Watson-Crick氢键,该AU二聚体56和58