A concise synthesis of 3-fluoro-5-thio-xylo- and glucopyranoses, useful precursors towards their corresponding pyranonucleoside derivatives
作者:Evangelia Tsoukala、Stella Manta、Niki Tzioumaki、George Agelis、Dimitri Komiotis
DOI:10.1016/j.carres.2008.02.004
日期:2008.5
acetylated 3-fluoro-5-thio-D-xylopyranose with silylated thymine afforded the corresponding nucleoside. Selective benzoylation and direct methanesulfonylation of 3-fluoro-1,2-O-isopropylidene-alpha-D-glucofuranose gave the 6-O-benzoyl-5-O-methylsulfonyl derivative, which on treatment with sodium methoxide afforded the 5,6-anhydro derivative. Treatment of the latter with thiourea, followed by acetolysis
1,2,4-三-O-乙酰基-3-脱氧-3-氟-5-硫代-D-吡喃葡萄糖,1,2,4,6-四-O-乙酰基-3-脱氧-的化学合成描述了3-氟-5-硫代-α-D-吡喃葡萄糖及其胸腺嘧啶的相应核苷。通过水解3-氟-1,2-O-异亚丙基-5-S-乙酰基5-硫代-的异亚丙基进行处理的3-氟-5-S-乙酰基-5-硫代-D-木呋喃糖的处理具有甲醇氨和直接乙酰化的D-木呋喃糖导致三乙酰化的3-脱氧-3-氟-5-硫代-D-木吡喃糖。乙酰化的3-氟-5-硫代-D-吡喃吡喃糖与甲硅烷基化的胸腺嘧啶缩合得到相应的核苷。3-氟-1,2-O-异亚丙基-α-D-葡萄糖呋喃糖的选择性苯甲酰化和直接甲磺酰化得到6-O-苯甲酰基-5-O-甲基磺酰基衍生物,其经甲醇钠处理后得到5,6-无水衍生物。后者用硫脲处理,然后进行乙酰分解,得到3-氟-5-S-乙酰基-6-O-乙酰基-1,2-O-异亚丙基-5-硫代-α-D-葡糖呋喃糖。将5