NMR and UV Study of 1,1′-(<i>α</i>,<i>ω</i>-Alkanediyl)bis[thymine] and 1,1′-(<i>α</i>,<i>ω</i>-Alkanediyl)bis[uracil]
作者:Toshio Itahara
DOI:10.1246/bcsj.70.2239
日期:1997.9
Treatment of thymine or uracil with Br(CH2)nBr (n = 3—10) in the presence of t-BuOK gave 1,1′-(α,ω-alkanediyl)bis[thymine] or 1,1′-(α,ω-alkanediyl)bis[uracil] together with 1-(ω-bromoalkyl)thymine or 1-(ω-bromoalkyl)uracil. The structures of these products were determined on the basis of the coupling constants between 5- and 3-positions of uracil ring on the 1H NMR spectra. Molecular aggregation of the thymine and uracil rings of these compounds in aqueous solution was studied on the basis of their 1H NMR and UV spectra. A stacking interaction of the two thymine rings linked by shorter polymethylene chains such as trimethylene and tetramenthylene groups was observed.
将胸腺嘧啶或尿嘧啶与Br(CH2)nBr(n = 3—10)在t-BuOK存在下处理,得到了1,1′-(α,ω-烷烃二基)双[胸腺嘧啶]或1,1′-(α,ω-烷烃二基)双[尿嘧啶],以及1-(ω-溴烷基)胸腺嘧啶或1-(ω-溴烷基)尿嘧啶。这些产物的结构是基于尿嘧啶环中5位和3位之间的耦合常数在1H NMR光谱上的分析来确定的。基于它们的1H NMR和紫外光谱,研究了这些化合物在水溶液中胸腺嘧啶和尿嘧啶环的分子聚集情况。观察到由较短的聚亚 methylene 链(如三亚甲基和四亚甲基基团)连接的两个胸腺嘧啶环之间存在堆叠相互作用。