Synthesis and incorporation of an α-hexofuranosyl thymidine into oligodeoxynucleotides via its two exocyclic OH-groups
作者:Vyacheslav V. Filichev、Erik B. Pedersen
DOI:10.1016/j.bmcl.2003.11.075
日期:2004.2
to the nucleobase. The appropriately substituted phosphoramidites were synthesised via 1-(5,6-di-O-acetyl-2,3-dideoxy-3-phthalimido-alpha-D-arabino-hexofuranosyl)thymine and used in oligodeoxynucleotide (ODN) synthesis. However, the binding affinity of the mixed ODNs towards complementary DNA and RNA was decreased compared to the wild-type oligos. The decrease was smaller when the monomer was inserted
1-(2,3-Dideoxy-3-amino-alpha-D-arabino-hexofuranosyl)thymine被认为是构型受限的无环核苷,使用呋喃糖环将二醇骨架连接至核碱基。通过1-(5,6-二-O-乙酰基-2,3-二脱氧-3-邻苯二甲酰亚胺-α-D-阿拉伯糖基-六呋喃糖基)胸腺嘧啶合成适当取代的亚磷酰胺,并将其用于寡脱氧核苷酸(ODN)合成。但是,与野生型寡核苷酸相比,混合ODN对互补DNA和RNA的结合亲和力降低了。当单体在序列末尾附近插入时,减少较小。插入αT序列或βT序列可使每个修饰的熔解温度下降几乎相同,这表明新的核苷酸修饰既具有α核苷酸又具有β核苷酸。