短肽的分子识别在超分子化学中是一个挑战,而肽样笼状受体的使用代表了一种有前途的方法。在这里,我们报告了使用不同技术(NMR,ESI-MS和荧光光谱法)组合的多种假肽大自行车家族的合成和表征,以及它们对N保护的二肽的结合能力。使用竞争性ESI-MS实验(高通量筛选)对笼宿主进行二肽结合分析,以获得识别现象的一般趋势。通过NMR光谱对选定的宿主进行了进一步研究(1在不同溶剂中的1 H NMR滴定和扩散有序光谱实验)。结果清楚地证明了[笼•二肽]超分子复合物的形成,并提供了有关相互作用强度(K ass)的定量信息。因此鉴定了伪肽笼框架内产生更强和更选择性的识别的结构变量。笼子显示出对N的显着选择性羧基末端带有芳香族氨基酸的保护性二肽,这促使我们提出一种基于极性和非极性非共价相互作用的结合方式。因此,我们面临的目标二肽(Ac-EY-OH)的分子识别,是通过在竞争激烈的媒体中通过NMR和荧光光谱法模仿生物学相关序列而实现的。
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。
Silver complexes of peptidomimetic polyazapyridinophanes. The influence of the bonding cavity size and the nature of side chains
作者:Ignacio Alfonso、Isabel Burguete、Santiago V. Luis、Juan F. Miravet、Piotr Seliger、Ewa Tomal
DOI:10.1039/b512762a
日期:——
Several peptidomimetic macrocycles containing a pyridine spacer and ring sizes ranging from 15 to 17 have been efficiently synthesized starting from valine and phenylalanine. The complexes formed have been investigated by potentiometry and NMR. Log K values show that phenylalanine derivatives 8 are consistently more stable than valine derivatives 7, whilst macrocycles with ring sizes of 16 members are the most appropriate for the complexation. The NMR data, in combination with molecular modeling, allow rationalization of the structure of the complexes formed and the participation of the aromatic rings from the side chain of phenylalanine in π-Ag+ interactions to be discarded.
New chiral tetraaza ligands for the efficient enantioselective addition of dialkylzinc to aromatic aldehydes
作者:M. Isabel Burguete、Jorge Escorihuela、Santiago V. Luis、Agustí Lledós、Gregori Ujaque
DOI:10.1016/j.tet.2008.07.099
日期:2008.10
enantioselective addition of dialkylzinc to aldehydes. These bis(amino amide) ligands show high enantioselectivity in the addition of organozincs to aromatic aldehydes. Different structural elements on the ligands seem to play an important role in determining the observed enantioselectivity. Ligand 4b (N,N′-bis(N-l-valinyl)-1,3-diaminopropane, with an aliphatic spacer with 3C atoms) catalyzed the addition of Et2Zn
作者:Jorge Becerril、M. Isabel Burguete、Beatriu Escuder、Francisco Galindo、Raquel Gavara、Juan F. Miravet、Santiago V. Luis、Gabriel Peris
DOI:10.1002/chem.200400031
日期:2004.8.20
The self-assembly of a series of smallpeptidomimeticcyclophanes in organic solvents was studied. X-ray diffraction, NMR spectroscopy, and molecular modelling were used to understand the structural features of these self-assembling compounds both at the molecular and supramolecular level. The factors that could influence the formation of gels rather than crystals were studied and a model for the arrangement
Pseudopeptidic macrocycles as cooperative minimalistic synzyme systems for the remarkable activation and conversion of CO<sub>2</sub> in the presence of the chloride anion
作者:Ferran Esteve、Belén Altava、M. Isabel Burguete、Michael Bolte、Eduardo García-Verdugo、Santiago V. Luis
DOI:10.1039/d0gc01449d
日期:——
A series of pseudopeptidic compounds have been assayed as organocatalyts for the conversion of CO2 into organic carbonates through a cooperative multifunctional mechanism. Conformationally constrained pseudopeptidicmacrocycles 3a and 3b have been revealed to be excellent synzymes for this purpose, being able to provide a suitable preorganization of the different functional elements and reaction components