A Novel Type of Hydrogen-Bonded Assemblies Based on the Melamine·Cyanuric Acid Motif
作者:Maria Arduini、Mercedes Crego-Calama、Peter Timmerman、David N. Reinhoudt
DOI:10.1021/jo020610c
日期:2003.2.1
derivatives (DAD motif). Furthermore, the synthesis and assembly studies are described of hydrogen-bonded assemblies 2-4.CA, comprised of three melamine derivatives that are covalently connected, and CA. The overall thermodynamicstability of assemblies 2-4.CA is superior to 1(3).CA (I(Tm) = 9 vs 3.6). The presence of the 2.CA complex in chloroform was confirmed by (1)H NMR spectroscopy and MALDI-TOF mass spectrometry
本文报道了新型氢键结合体1(3).CA的形成,该反应是通过将氰尿酸(CA)与三聚氰胺衍生物1混合而获得的,其中三个可能的H键阵列中的两个已被封闭。四个成分通过9个氢键结合在一起,形成一个刚性平面结构,其中一个中央CA(三个ADA图案:A =受体,D =供体)被氢键合到三个外围的三聚氰胺衍生物(DAD图案)上。此外,描述了氢键结合的组装体2-4.CA和CA的合成和组装研究,该组装体由三种共价连接的三聚氰胺衍生物组成。组件2-4.CA的整体热力学稳定性优于1(3).CA(I(Tm)= 9 vs 3.6)。通过(1)1 H NMR光谱法和MALDI-TOF质谱法确认了在氯仿中2.CA络合物的存在。用手性或荧光基团(R(3))替代三聚氰胺使得能够通过CD和荧光光谱研究组件。滴定实验表明,即使在极性溶剂(例如THF和CH(3)OH)存在下,稳定性也大大增强。根据溶剂的极性,观察到平面组装单元之间的堆叠。
Synthesis of Fmoc-Triazine Amino Acids and Its Application in the Synthesis of Short Antibacterial Peptidomimetics
作者:Pethaiah Gunasekaran、Eun Young Kim、Jian Lee、Eun Kyoung Ryu、Song Yub Shin、Jeong Kyu Bang
DOI:10.3390/ijms21103602
日期:——
AMPs remains the greatest challenge in their transformation into therapeutics. Herein, we synthesized Fmoc-triazine aminoacids that differ from each other by anchoring either cationic or hydrophobic residues. These unnatural aminoacids were adopted for solid-phase peptide synthesis (SPPS) to synthesize a series of amphipathic antimicrobial peptidomimetics. From the antimicrobial screening, we found
which decreased the rotational barrier of the CNbond in the dithiocarbamate group attached to the triazinyl ring. The higher electron population on the triazine moiety stabilizes the partial double bond character of the S Cbond, which competitively excludes the double bond character of the CNbond. Therefore, the rotational dynamics of the CNbond in dithiocarbamates can be a sensitive probe to
作者:Piotr Lipkowski、Anna Bielejewska、Peter Timmerman、David N. Reinhoudt、Huub Kooijman、Anthony L. Spek
DOI:10.1039/a903446c
日期:——
Formation of 24 cooperative hydrogen bonds drives the spontaneous assembly of a rigid bifunctional trimelamine and bis(barbituric acid) to give selectively the [2 × 2] hydrogen-bonded grid, in preference to the corresponding [1 × 1] or polymeric assemblies.