Facile synthesis of chiral unsymmetric perylene tetracarboxylic diimides involving α-amino acids
摘要:
A facile synthesis of chiral unsymmetric perylene tetracarboxylic diimides (PDIs) has been developed and the first two nonracemic chiral amphiphilic PDIs have been synthesized. The key building blocks, AB bifunctional 3,4,9, 10-perylenetetracarboxylic-3,4-anhydride-9, 10-imides, were prepared conveniently from enantiomerically pure alpha-amino acids, which were introduced as the steric and stereochemical controlling units. Such building blocks allow the incorporation of sterically and stereochemically controlled PDI moieties into both terminal and inner positions. (c) 2007 Elsevier Ltd. All rights reserved.
Stable supramolecular helical structure of C6-symmetric hydrogen-bonded hexakis(phenylethynyl)benzene derivatives with amino acid pendant groups and their unique fluorescence properties
Efficient Microwave-Assisted Synthesis of Ionic Esterified Amino Acids
作者:Ricardo Cerón-Camacho、Jorge Aburto、Luisa E. Montiel、Eugenio A. Flores、Frisia Cuellar、Rafael Martínez-Palou
DOI:10.3390/molecules16108733
日期:——
In this work, an efficient microwave-assisted methodology for the esterification of unprotected α-amino acids is described. Ionic esterified amino acids were synthesized in satisfactory yields in a facile one-pot solventless protocol from unprotected amino acids and alcohols under acid catalysis (MsOH or p-TsOH) to afford the pure products after a simple work-up procedure. This procedure can also be extended to the preparation of long and short chain alkyl and benzyl esters.
Gel-solution phase transition of organogels with photoreversibility: l-amino acid organogelators with azobenzene
作者:Masahiro Suzuki、Yukari Maruyama、Kenji Hanabusa
DOI:10.1016/j.tetlet.2016.06.111
日期:2016.8
Simple organogelators with organic salt structures by mixing of l-amino acid dodecyl esters and azobenzene-4-caroboxylic acid, were synthesized and their organogelation properties were examined. These gelators formed organogels in many organic fluids. The acetonitrile gels showed a reversibly photochemical phase transition; they changed into the solution under ultraviolet light (365 nm), and then it
Organogels are used in a wide range of applications for which the development of new bio-based organogelators is highly desirable. While furan-2,5-dicarboxylic acid (FDCA) is a promising molecule for the synthesis of bio-based polyesters, it has never been used in the context of organogels. This study explores the possibility to design FDCA-based organogelators that self-assemble into fibrillar networks
有机凝胶具有广泛的应用,因此非常需要开发新型生物基有机凝胶剂。虽然呋喃-2,5-二甲酸 (FDCA) 是一种很有前景的生物基聚酯合成分子,但它从未用于有机凝胶。本研究探讨了设计基于 FDCA 的有机凝胶剂的可能性,该凝胶剂可自组装成通过氢键稳定的纤维网络。凝胶测试表明该凝胶剂系列具有多种凝胶液体(尤其是非极性液体)的多功能性。通过 FTIR 和 CD 光谱、晶体学、粉末 X 射线衍射和流变学研究了凝胶的结构。
Molecular Assembly and Gelating Behavior of (<scp>l</scp>)‐Alanine Derivatives
A low-molecular-weight organogelator derived from (L)-amino acids was designed and synthesized. The (L)-alanine derivatives were determined to be excellent gelators, forming good gels even when smaller amounts were added. Self-molecular aggregates were observed to be helical or sheet-like, and the gels were constructed by forming aggregates by self-molecular recognition.