The invention is related to anti-viral compounds, compositions containing such compounds, and therapeutic methods that include the administration of such compounds, as well as to processes and intermediates useful for preparing such compounds.
The invention is related to anti-viral compounds, compositions containing such compounds, and therapeutic methods that include the administration of such compounds, as well as to processes and intermediates useful for preparing such compounds.
Synthesis and activity of 5′-Uridinyl dipeptide analogues mimicking the amino terminal peptide chain of nucleoside antibiotic mureidomycin A
作者:Nigel I Howard、Timothy D.H Bugg
DOI:10.1016/s0968-0896(03)00270-0
日期:2003.7
A series of 5'-uridinyl dipeptides were synthesised which mimic the amino terminal chain of nucleoside antibiotic mureido omycin A. Aminoacyl-beta-alanyl- and aminoacyl-N-methyl-beta-alanyl- dipeptides were attached either via an ester linkage to the 5'-hydroxyl of uridine. or via an amide linkage to 5-amino-5-deoxyuridine. The most active inhibitor of Escherichia coli phosphoMurNAc-pentapeptide translocase (MraY) was 5'-O-((L)-Ala-N-methyl-beta-alanyl)-uridine (131), which also showed 97% enzyme inhibition at 2.35mM concentration, and showed antibacterial activity at 100 mug/mL concentration against Pseudomonas putida. Both the central N-methyl amide linkage and a 5' uridine ester linkage were required for highest biological activity. Enzyme inhibition was shown to be competitive with Mg2+. It is proposed that the primary amino terminus of the inhibitor binds in place of the Mg2+. cofactor at the MraY active site, positioned via a cis-N-methyl amide linkage. (C) 2003 Elsevier Science Ltd. All rights reserved.
Synthesis and dopamine receptor modulating activity of lactam conformationally constrained analogs of Pro-Leu-Gly-NH2
作者:Uma Sreenivasan、Ram K. Mishra、Rodney L. Johnson
DOI:10.1021/jm00054a010
日期:1993.1
A series of analogues of the potent analogue of Pro-Leu-Gly-NH2 (PLG), 2-oxo-3(R)-[(2(S)-pyrrolidinylcarbonyl)amino]-1-pyrrolidineacetamide (2) were synthesized in which the (R)-gamma-lactam residue of 2 was replaced with a (R)-beta-lactam, (R)-aminosuccinimide, (R)-cycloseryl, (R)-delta-lactam, (R)-epsilon-lactam, or (S)-epsilon-lactam residue to give analogues 3-8, respectively. These substitutions were made so as to vary the psi2 torsion angle. The analogues were tested for their ability to enhance the binding of the dopamine receptor agonist ADTN to the dopamine receptor. Analogues 3-6 and 8 exhibited dose-response curves that were bell-shaped in nature with the maximum effect occurring at a concentration of 1 muM. Analogue 7 was inactive. Analogues 3 and 4 were found to be as effective as PLG, while analogues 5, 6, and 8 appeared to be more effective than PLG in terms of enhancing the binding of ADTN to dopamine receptors. The activity of analogues 3-6 and 8 with their psi2 angles in the vicinity of that observed in a type II beta-turn is consistent with the hypothesis that this type of turn is the bioactive conformation of PLG.