Synthesis of novel 6-substituted thymine ribonucleosides and their 3′-fluorinated analogues
作者:Tatyana S. Bozhok、Grigorii G. Sivets、Alexander V. Baranovsky、Elena N. Kalinichenko
DOI:10.1016/j.tet.2016.08.065
日期:2016.10
Nine novel 6-fluorothymine nucleoside analogues of both N(1)-α/β and N(3)-β-ribo series were prepared by the Vorbrüggen method starting from persilylated 6-fluorothymine and 1-O-acetyl-2,3,5-tri-O-benzoyl-β-d-ribofuranose, 1-O-acetyl-2,5-di-O-benzoyl-3-deoxy-3-fluoro-α,β-d-ribofuranose or 1,2,3,5-tetra-O-benzoyl-β-d-ribofuranose and its α-anomer. Protected N(3)-β-d-ribofuranosides were prepared as
N(1)-α/β和N(3)-β-ribo系列的9种新颖的6-氟胸腺嘧啶核苷类似物是通过Vorbrüggen方法制备的,其方法是从被甲硅烷基化的6-氟胸腺嘧啶和1-O-乙酰基2,3, 5-三-O-苯甲酰基-β - d-呋喃核糖,1-O-乙酰基-2,5-二-O-苯甲酰基-3-脱氧-3-氟-α,β- d-核呋喃糖或1,2, 3,5-四-O-苯甲酰基-β - d-呋喃呋喃糖及其α-端基异构体。受保护的N(3)-β- d在室温下以高产率将核糖呋喃糖苷制备为唯一产品。在较低温度下获得苯甲酰化的N(1)-β-和α-异头核糖核苷的混合物。β-异头物的产率和缩合反应的立体选择性(β:α= 2.2 / 4.5:1)取决于反应条件和糖基化剂的结构。LiOH一水合物在MeCN / H 2 O中对6-氟胸腺嘧啶N(1)-或N(3)-β- d-核呋喃糖苷及其3'-氟脱氧类似物进行脱苯甲酰化反应,得到相应的氟化核苷