提出了用于自组装成玫瑰状纳米管的四环自互补分子4的合成。这种新的杂环具有包含两个稠合在一起的吡啶并[2,3- d ]嘧啶分子的核心结构,并具有鸟嘌呤(G)和胞嘧啶(C)的沃森-克里克氢键供体-受体阵列。当前合成吡啶并[2,3- d ]嘧啶的方法需要苛刻的条件和长的反应时间,并且通常导致低的产物产率。这对于不能直接承受这些条件的官能团的直接掺入特别成问题。在这里,我们提出了一种访问多功能吡啶并[2,3- d ]嘧啶中间体2的有效方法在相对温和的条件下,在三氯化合物1上在C2,C4和C7处使用三个区域选择性S N Ar反应。所述吸电子基团和氨基官能团2随后被用作一个手柄安装的第三和第四环4使用德兰德型缩合,接着混合尿素合成和环化。
Water-Soluble J-Type Rosette Nanotubes with Giant Molar Ellipticity
作者:Gabor Borzsonyi、Rachel L. Beingessner、Takeshi Yamazaki、Jae-Young Cho、Andrew J. Myles、Marek Malac、Ray Egerton、Masahiro Kawasaki、Kazuo Ishizuka、Andriy Kovalenko、Hicham Fenniri
DOI:10.1021/ja105028w
日期:2010.11.3
A new self-assembling tricyclic module (x K1) featuring the Watson Crick H-bonding arrays of guanine and cytosine fused to an internal pyridine ring was synthesized. When dissolved in water at room temperature, this module rapidly self-assembles into hexameric rosettes, which then stack to form J-type rosette nanotubes (RNTs) with increased inner/outer diameters and the largest molar ellipticity ever reported (4 x 10(6) deg.M-1.m(-1)). Using a combination of imaging and spectroscopic techniques we established the structure of x K1-RNT and have shown that the extended pi system of the self-assembling module resulted in a new family of J-type RNTs with enhanced inter-modular electronic communication.