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。
Efficient Macrocyclization of U-Turn Preorganized Peptidomimetics: The Role of Intramolecular H-Bond and Solvophobic Effects
作者:Jorge Becerril、Michael Bolte、M. Isabel Burguete、Francisco Galindo、Enrique García-España、Santiago V. Luis、Juan F. Miravet
DOI:10.1021/ja0284759
日期:2003.6.1
acetonitrile to very efficiently yield macrocyclic structures. The cyclization reaction does not require high dilution techniques and seems to be insensitive to the size of the formed macrocycle. The analysis of data obtained by (1)H NMR, single-crystal X-ray diffraction, fluorescence measurements, and molecular mechanics indicate that folded conformations can preorganize the system for an efficient cyclization
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。
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