摘要:
New partially retro-inverted tuftsin analogues of general formula I wherein R represents the side-chain of the amino acids threonine, methionine or leucine R¹ represents the side-chain of the amino acids lysine or arginine R² is hydrogen or a metabolically labile acyl group, all the asymmetric carbon atoms are either of the S- or R-configuration, or, alternatively, the first, third, and fourth asymmetric carbons, starting from the N-terminal residue, are of the S-configuration while the second one is of the R- or (R,S)-configuration, and the corresponding pharmacologically acceptable salts, esters and amides. The new compounds which share the same pharmacological properties of tuftsin, are much more stable toward the enzymatic degradation than the parent molecule.
摘要:
New partially retro-inverted tuftsin analogues of general formula I wherein R represents the side-chain of the amino acids threonine, methionine or leucine R¹ represents the side-chain of the amino acids lysine or arginine R² is hydrogen or a metabolically labile acyl group, all the asymmetric carbon atoms are either of the S- or R-configuration, or, alternatively, the first, third, and fourth asymmetric carbons, starting from the N-terminal residue, are of the S-configuration while the second one is of the R- or (R,S)-configuration, and the corresponding pharmacologically acceptable salts, esters and amides. The new compounds which share the same pharmacological properties of tuftsin, are much more stable toward the enzymatic degradation than the parent molecule.
摘要:
New analogues of thymopentin (TP5) and of its tetrapeptide fragment (TP5¹⁻⁴) containing two non-contiguous retro-inverted bonds in the peptide chain are described. The new compounds, of general formula (I) where R is hydrogen or an acyl radical, and R¹ is an -OR² group or an group where R² is a hydrogen atom or a hydrocarbon radical, and R³ is a hydrogen atom or a hydroxyl group, and the corresponding pharmaceutically acceptable salts of acid or basic addition, possess immunomodulating activity.
摘要:
A method of synthesis of a partially retro-inverso peptide incorporating at least one malonyl residue of formula (III) -CO- H-CO- (III)
wherein R represents the side chain of an α-amino acid, is described which is characterized in that said malonyl residue is incorporated by condensing a 5-substituted-2,2-dimethyl-1,3-dioxane-4,6-dione of formula (VI) wherein R′ is the side-chain R wherein the functional groups, if any, are suitably protected, with an amino acid, amino acid amide, peptide fragment, or pseudo-peptide fragment wherein the terminal carboxyl group, if present, and the possible side-chain functionalities are suitably protected and the reactive amino group is tri-alkyl-silylated. The new compounds of formula (VI) and a process for the preparation of a partially retro-inverso tuftsin analog which involves use of said method and said intermediate are also described and claimed.
摘要:
New retro-inverso analogs of thymopentin (TP5) and of its tripeptide fragment (TP5¹⁻³) of general formula (I) are described wherein R is hydrogen or an acyl radical, and R¹ is -OR² or wherein R² is hydrogen or a hydrocarbyl radical, and the corresponding pharmaceutically acceptable acid- or base-addition salts. The new compounds are enzyme-resistant immunomodulatory peptides.
摘要:
N α -fluorenylmethoxycarbonyl-N G -trityl-arginine, a new protected arginine derivative, and its use in peptide syntheses are described. The new compound can be prepared by a three step process, via formation of N α -trityl-N G -trityl-arginine, selective mono-deprotection of said intermediate, and introduction of the fluorenylmethoxycarbonyl group on the amino function.
摘要:
The present invention refers to a new class of malonic acid derivatives of general formula I wherein R¹ and R², each independently, represent hydrogen or a carboxyl protecting group, and the residue R corresponds to the side-chain of the amino acids lysine, ornithine, tyrosine, cysteine, aspartic acid and glutamic acid wherein the additional functionalities are suitably protected. The new compounds of the present invention are useful for preparing analogues of biologically active peptides wherein the direction of some amide bonds in which the amino acids lysine, ornithine, tyrosine, cysteine, aspartic acid or glutamic acid are involved, has been reversed.
摘要:
New partially retro-inverso peptides of the following general formula wherein R' and R' are the same or different and represent, each independently, the side chain of the aminoacid residues present in the naturally occuring peptides, X is -S-Ph pr -O-CH 2 -Ph and Z is a hydroxy, alkoxy or amino group, ate described as well as a suitable method for their preparation. The new compounds are useful as antihypertensive agents.