Triuracils – 1,3-Bis[ω-(N-methyluracil-1-yl)alkyl]thymines and Their 5,5′-Cyclic Counterparts
作者:Vyacheslav E. Semenov、Leisan F. Galiullina、Olga A. Lodochnikova、Olga N. Kataeva、Aidar T. Gubaidullin、Alla V. Chernova、Yurij Y. Efremov、Shamil K. Latypov、Vladimir S. Reznik
DOI:10.1002/ejoc.200700162
日期:2007.9
A series of acyclic compounds with two 3,6-dimethyluracil or 3-methyluracil units attached to a a thymine or isocyanurate fragment by polymethylene or xylylene spacers are investigated. Ring-closure reactions with paraformaldehyde in aqueous HCl in the presence of copper(I) chloride afforded pyrimidinophanes which can be considered macrocyclic counterparts of the acyclic triuracils. By X-ray diffraction
研究了一系列无环化合物,其中两个 3,6-二甲基尿嘧啶或 3-甲基尿嘧啶单元通过聚亚甲基或二甲苯间隔物连接到胸腺嘧啶或异氰脲酸酯片段。在氯化铜 (I) 存在下,在 HCl 水溶液中与多聚甲醛发生闭环反应得到嘧啶并烷,它可以被认为是无环三尿嘧啶的大环对应物。通过 X 射线衍射数据,固态大环的结构以尿嘧啶单元的紧密排列为特征,但它们之间没有 π-π 接触。相反,大环三尿嘧啶与其无环对应物相比显着减色表明在氯仿和 H2O 溶液中胸腺嘧啶和 3,6-二甲基尿嘧啶单元之间存在堆积。溶液中无环和大环化合物的构象行为已通过 NMR、UV 和计算方法确定。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)