源自氨基酸的简单拟肽分子在乙腈中与间位和对位双(溴甲基)苯反应,非常有效地产生大环结构。环化反应不需要高稀释技术,并且似乎对形成的大环的大小不敏感。通过 (1)H NMR、单晶 X 射线衍射、荧光测量和分子力学获得的数据分析表明,折叠构象可以预先组织系统以实现有效的环化。分析了在折叠构象存在下分子内氢键和疏溶剂效应所起的作用。
A simple peptidomimetic that self-associates on the solid state to form a nanoporous architecture containing chiral π-channels
作者:Jorge Becerril、Michael Bolte、M. Isabel Burguete、Jorge Escorihuela、Francisco Galindo、Santiago V. Luis
DOI:10.1039/b922172g
日期:——
The crystal structure of a simple peptidomimetic compound, derived from phenylalanine, shows the formation of a nanoporous architecture containing monodimensional Ï-channels with the aromatic rings as the exclusive components of the chiral channel walls.
Cu<sup>2+</sup> recognition by N,N′-benzylated bis(amino amides)
作者:Lingaraju Gorla、Vicente Martí-Centelles、Belén Altava、M. Isabel Burguete、Santiago V. Luis
DOI:10.1039/c6dt04756d
日期:——
amides) have been synthesised and their interaction with different transition metals studied using a variety of techniques including UV-Vis and CD spectroscopy or ESI-MS. The determination of the corresponding stabilityconstants with Cu2+ has been possible, in H2O/CH3CN 7/3 v/v, for one of these ligands (4) using potentiometric titrations. The results obtained reveal that N-benzylation affords significant
已经合成了两个新的C 2对称的N,N'-苄基化的双(氨基酰胺),并使用多种技术(包括UV-Vis和CD光谱法或ESI-MS)研究了它们与不同过渡金属的相互作用。在H 2 O / CH 3 CN 7/3 v / v中,使用电位滴定法可以测定其中一种配体(4)的Cu 2+对应的稳定常数。获得的结果表明,N-苄基化显着改变了它们的性质,并伴随着相应络合稳定性常数的显着降低。然而,这,与相关联的与Ni的低动力学沿2+,便于识别的Cu 2+通过4可随后肉眼到亚毫摩尔范围内。非常有趣的是,该配体的手性为相应的Cu 2+配合物提供了强烈而清晰的CD曲线,对配位几何非常敏感,即使在μM范围内,也有助于分析这种相互作用。由两个配体(3和4)形成具有Cu 2+的方形平面络合物X射线晶体结构证实了Ni 2+的化学计量比为1:1。
Chiral Diaminodiamide Copper(II) Complexes for the Enantioselective Recognition of Amino Acids: Synthesis of the Ligands and Formation Constants
-bis(aminoacyl)propanediamines (AA-NN-2 and AA-NN-3, respectively, AA = alanine, phenylalanine, valine) were synthesized as the dihydrochlorides, and their complexes with Cu(II) studied potentiometrically. Since these ligands in the presence of Cu(II) are able to perform chiral resolution of D,L-dansylamino acids in HPLC (reversed phase), in a certain pH range (6.5–8.5), it is important to know the equilibria existing