Synthesis and Conformational Analysis of 1-[2,4-Dideoxy-4-<i>C</i>-hydroxymethyl-α-<scp>l</scp>-lyxopyranosyl]thymine
作者:Veerle Vanheusden、Roger Busson、Piet Herdewijn、Serge Van Calenbergh
DOI:10.1021/jo040130g
日期:2004.6.1
synthesis of 4 involves the stereoselective introduction of the hydroxymethyl group onto the C-4 carbon of the pyranose sugar. Attempts to achieve this via hydroboration/oxidation of a C-4‘-exocyclic vinylic intermediate selectively yielded the undesired α-directed hydroxymethyl group. Therefore, we envisaged another approach in which the C-4 substituent was introduced upon treatment of 2,3-O-isop
先前已经评估了具有六元碳水化合物部分的不同类型的核苷的潜在抗病毒和抗生素特性,并将其作为核酸合成的基础。然而,尚未研究具有1,4-取代模式的吡喃糖核苷,如1- [2,4-二脱氧-4 - C-羟甲基-α - 1 - lyxopyranosyl]胸腺嘧啶(4)。建模表明,与最稳定构象为1 C 4的脱水己糖醇核苷(1)相比,该核苷将显示4 C 1构象。合成的关键4涉及将羟甲基立体选择性地引入吡喃糖的C-4碳上。尝试通过C-4'-环外乙烯基中间产物的硼氢化/氧化来选择性地产生不希望的α-定向的羟甲基。因此,我们设想了另一种方法,其中在用β-三丁基锡烷基苯乙烯处理2,3 - O-异亚丙基-1- O-甲基-4 - O-苯氧基硫代羰基-α - 1 - ly-吡喃葡萄糖时引入C-4取代基。这允许在C-4处通过立体定向β定向引入2-苯基乙烯基,该基团通过氧化/还原反应进行了转化(OsO 4,NaIO 4 /