Efficient synthesis of substituted oxopiperazines from amino acids
摘要:
The synthesis of substituted oxopiperazines, which may act as conformationally constrained peptide mimics, is reported. The synthesis is based on the cyclization of sulfonamide dipeptides with dibromoethane as the 1, 2-dielectrophile. Alternatively, these mimetics were prepared via a Mitsunobu reaction. (C) 1998 Elsevier Science Ltd. All rights reserved.
Efficient synthesis of substituted oxopiperazines from amino acids
摘要:
The synthesis of substituted oxopiperazines, which may act as conformationally constrained peptide mimics, is reported. The synthesis is based on the cyclization of sulfonamide dipeptides with dibromoethane as the 1, 2-dielectrophile. Alternatively, these mimetics were prepared via a Mitsunobu reaction. (C) 1998 Elsevier Science Ltd. All rights reserved.
studies and molecular dynamics simulations. CF3-threonine containing pentapeptides are more prone to mimic β-strands than their natural Ser and Thr pentapeptide analogues. The proof of concept that these fluorinated β-strandmimics are able to disrupt protein-protein interactions involving β-sheet structures is provided. The CF3-threonine containing pentapeptides interact with the amyloid peptide Aβ1-42
Synthesis and Host−Guest Studies of Chiral <i>N</i>-Linked Peptidoresorc[4]arenes
作者:Bruno Botta、Ilaria D'Acquarica、Giuliano Delle Monache、Deborah Subissati、Gloria Uccello-Barretta、Massimo Mastrini、Samuele Nazzi、Maurizio Speranza
DOI:10.1021/jo7016636
日期:2007.11.1
(10, 11, ent-10, and ent-11) tetrafunctionalized at the feet with valyl-leucine [ll- (6); dd- (ent-6)] and leucyl-valine [ll- (9); dd- (ent-9)] methyl esters have been synthesized. These compounds, obtained by conjugation of macrocycle tetracarboxylic acid chlorides with the appropriate terminal amino groups of the above dipeptides, are N-linked peptidoresorc[4]arenes. We found that these macrocycles
disorder with respect to the “monomer”, the molecular conformation being accountable for by unstructured polypeptide chains together with β-turns. The polymer is able to adopt supramolecular structures reminiscent of those found in elastin. Unlike that of the heptapeptide, polycondensation of the nonapeptide did not afford a linear polymer, but only cyclic derivatives. This could well be due to the tendency
Synthesis and Peptide Binding Properties of Methoxypyrrole Amino Acids (MOPAS)
作者:Christoph Bonauer、Manfred Zabel、Burkhard König
DOI:10.1021/ol049855x
日期:2004.4.1
[structure: see text] Methoxypyrrole amino acids (MOPAS) have been prepared and were introduced into small peptides with hairpin structures. The intra- and intermolecular binding properties of this heterocyclic amino acid mimicking a dipeptido beta-strand was investigated by NMR titration and X-ray crystal structure analysis. The data reveal a hydrogen bonding pattern that is complementary to a peptide