Proline derivatives of the formulae: ##STR1## wherein R.sup.1 through R.sup.11 have defined values, and acid- and base-addition salts thereof, and equilibrium addition compounds of the aldehyde group thereof; processes for their preparation; pharmaceutical compositions; and intermediates for preparing said proline derivatives. The proline derivatives are human leukocyte elastase inhibitors which are useful, for example, in treating pulmonary emphysema.
CO2 in Supramolecular Chemistry: Preparation of Switchable Supramolecular Polymers
作者:Heng Xu、Dmitry M. Rudkevich
DOI:10.1002/chem.200306062
日期:2004.11.5
by 1H and 13C NMR spectroscopy. The morphology of supramolecular gel 13 was studied by scanning electron microscopy. Addition of a competitive solvent destroyed the hydrogen bonding in assembling structures 11 and 13, but did not influence the carbamate linkers; carbamate salts 12 and 14, respectively, were obtained. On the other hand, thermal release of CO2 from 11 and 13 was easily accomplished (1
CO2气体用于构建新型的超分子聚合物。制备了自组装纳米结构11和13,其使用氢键和动态的,热可逆的氨基甲酸酯键。作为前体,合成杯芳烃脲1和2,它们在非极性溶液中强烈聚集/二聚(每个胶囊K(D)> == 10(6)M(-1)),形成自组装胶囊7和线性聚合物链8分别在外周上具有“亲 ”伯氨基。 在非极性溶剂中与分子7和8有效反应,并使它们交联,形成多个氨基甲酸酯盐桥。制备低聚物聚集体11和三维聚合物网络13,并通过1 H和13 C NMR光谱表征。超分子凝胶13的形态通过扫描电子显微镜研究。加入竞争性溶剂会破坏组装结构11和13中的氢键,但不会影响氨基甲酸酯连接基;分别获得了氨基甲酸酯盐12和14。另一方面,从11和13轻松释放 (1小时,100摄氏度),同时保留氢键胶囊。因此,三维聚合物网络13被转化回线性聚合物链8而没有破裂。证明了11和13对溶剂分子的包封和存储。这为可转换的
Peptidic molecular brushes with enhanced chirality
lysine octamer, and the secondary structures of the oligopeptide side chains in solutions were investigated. To examine the architecture effects on helical conformation, circular dichroism spectra from the polymer were compared with that from the corresponding macromonomer. To check the chemical structural effects on conformation of the oligopeptide, Cbz groups from the molecular brushes were deprotected
Synthesis of regular polypeptides including L-lysine and glycine
作者:A. V. Zakirov、V. G. Debabov
DOI:10.1007/bf00564253
日期:1970.7
Supramolecular Structures from Lysine Peptides and Carbon Dioxide
作者:Vaclav Stastny、Anjenique Anderson、Dmitry M. Rudkevich
DOI:10.1021/jo061144k
日期:2006.11.1
The design, synthesis, and characterization of novel linear and cross-linked supramolecular polymers that are easily available from biologically friendly lysine peptides and carbon dioxide (CO2) are reported here. Polymeric structures 5, 6, and 19 readily form from peptides 2, 3, and 15, respectively, at ambient temperatures by simply bubbling CO2 through their solutions in apolar organic solvents (CHCl3, benzene) and even in the presence of 10% MeOH. The resulting gels can be easily isolated from solution, dried, and stored refrigerated for several months. At the same time, they may thermally release CO2 and convert back to the corresponding monomers. As a consequence, their structures and physical properties are switchable. They may also trap, store, and release foreign molecules. The typical entrapment procedure was demonstrated for tripeptide 3, CO2, and the commercially available dye coumarin 2.