Analogs of Ac-CCK-7 incorporating dipeptide mimics in place of Met28-Gly29
摘要:
A series of analogs of Ac-CCK-7 [Ac-Tyr(SO3H)-Met28-Gly29-Trp-Met-Asp-Phe-NH2, (1)] Were prepared in which the Met28-Gly29 dipeptide was replaced by omega-aminoalkanoic acids. Compounds were assessed in binding assays using homogenated rat pancreatic membranes and bovine striatum as the source of CCK-A and CCK-B receptors, respectively, and for anorectic activity after intraperitoneal administration to rats. The analog incorporating 4-aminobutanoic acid (5) was only 8 times less potent than 1 in the pancreatic binding assay, was more potent in the striatal binding assay, and was more potent than 1 in reducing food intake in rats. Using a bioactive cyclic analog of Ac-CCK-7 as a template, several rigid spacers were designed and tested as substitutes for the Met28-Gly29 dipeptide. The analogs incorporating 3-aminobenzoic acid (20) and (1S)-trans-2-aminocyclopentanecarboxylic acid (26) proved highly effective in the binding assays and as anorectic agents. We hypothesize that for stimulation of CCK-A receptors, the main function of the N-terminal tripeptide of Ac-CCK-7 is to orient the tyrosine sulfate with respect to Trp30 and that the bioactive arrangement of these elements lies among those which are readily available to both 20 and 26. NOESY and distance-constrained molecular dynamics experiments carried out on 20 and 26 identified conformations in which the relative orientation of the tyrosine hydroxide and the alpha-carbon atom of tryptophan were similar, providing the basis for further drug design efforts.
Highly Enantioselective γ-Amination of α,β-Unsaturated Acyl Chlorides with Azodicarboxylates: Efficient Synthesis of Chiral γ-Amino Acid Derivatives
摘要:
The cinchona alkaloid-catalyzed gamma-amination of alpha,beta-unsaturated acyl chlorides with azodicarboxylates to give the corresponding dihydropyridazinones in good yields with high enantioselectivities has been developed. Reductive ring opening of the dihydropyridazinones afforded series of cyclic and acyclic gamma-amino acid derivatives in good yields with high enantiopurity.
Synthesis of γ-aminobutyric acid analogues of restricted conformation. Part 1. The 2-aminocycloalkylacetic acids
作者:Peter D. Kennewell、Saroop S. Matharu、John B. Taylor、Robert Westwood、Peter G. Sammes
DOI:10.1039/p19820002553
日期:——
The syntheses of cis- and trans-2-aminocyclopropyl, -cyclobutyl, -cyclopentyl, and -cyclohexylacetic acids as γ-aminobutyricacidanalogues of restrictedconformation are described. Mass spectral evidence fully supports the stereochemical assignments of the configurational isomers.
Asymmetrische reduktive Aminierung von Cycloalkanonen, 9. Mitt.: Die asymmetrische Synthese GABA-verwandter cycloaliphatischer Aminosäuren
作者:Farghaly Omar、August W. Frahm
DOI:10.1002/ardp.19893220803
日期:——
wird die asymmetrische Synthese von optisch aktiven cis‐1‐ Aminocyclopentan‐ bzw. cyclohexan‐2‐essig‐ und ‐2‐propionsäure‐Hydrochloriden 5 beschrieben. In einem vierstufigen Verfahren werden die racem. 1‐Cycloalkanon‐2‐essigsäure‐ und 2‐propionsäure‐Derivate 1 mit den chiralen Hilfsaminen R‐(+)‐ und S‐(‐)‐1‐Phenylethylamin zuerst in die Imin‐Isomerengemische 2 überführt, die nach Hydrierung über Raney‐Nickel
Es wird die asymmetrische Synthese von optisch aktiven cis-1- Aminocyclopentan-bzw。环己-2-essig-和-2-propionsäure-Hydrochloriden 5 beschrieben。在 einem vierstufigen Verfahren werden die racem。1-Cycloalkanon-2-essigsäure- und 2-propionsäure-Derivate 1 mit den chiralen Hilfsaminen R-(+)- und S-(-)-1-Phenylethylamin zuerst in die Imin-Isomerengemische 2 überführt, ung die n Nickel die cis-konfigurierten sekundären
Analogs of Ac-CCK-7 incorporating dipeptide mimics in place of Met28-Gly29
作者:Jefferson W. Tilley、Waleed Danho、Shian Jan Shiuey、Irina Kulesha、Joseph Swistok、Raymond Makofske、Joseph Michalewsky、Joseph Triscari、David Nelson
DOI:10.1021/jm00099a005
日期:1992.10
A series of analogs of Ac-CCK-7 [Ac-Tyr(SO3H)-Met28-Gly29-Trp-Met-Asp-Phe-NH2, (1)] Were prepared in which the Met28-Gly29 dipeptide was replaced by omega-aminoalkanoic acids. Compounds were assessed in binding assays using homogenated rat pancreatic membranes and bovine striatum as the source of CCK-A and CCK-B receptors, respectively, and for anorectic activity after intraperitoneal administration to rats. The analog incorporating 4-aminobutanoic acid (5) was only 8 times less potent than 1 in the pancreatic binding assay, was more potent in the striatal binding assay, and was more potent than 1 in reducing food intake in rats. Using a bioactive cyclic analog of Ac-CCK-7 as a template, several rigid spacers were designed and tested as substitutes for the Met28-Gly29 dipeptide. The analogs incorporating 3-aminobenzoic acid (20) and (1S)-trans-2-aminocyclopentanecarboxylic acid (26) proved highly effective in the binding assays and as anorectic agents. We hypothesize that for stimulation of CCK-A receptors, the main function of the N-terminal tripeptide of Ac-CCK-7 is to orient the tyrosine sulfate with respect to Trp30 and that the bioactive arrangement of these elements lies among those which are readily available to both 20 and 26. NOESY and distance-constrained molecular dynamics experiments carried out on 20 and 26 identified conformations in which the relative orientation of the tyrosine hydroxide and the alpha-carbon atom of tryptophan were similar, providing the basis for further drug design efforts.
Highly Enantioselective γ-Amination of α,β-Unsaturated Acyl Chlorides with Azodicarboxylates: Efficient Synthesis of Chiral γ-Amino Acid Derivatives
作者:Li-Tao Shen、Li-Hui Sun、Song Ye
DOI:10.1021/ja206819y
日期:2011.10.12
The cinchona alkaloid-catalyzed gamma-amination of alpha,beta-unsaturated acyl chlorides with azodicarboxylates to give the corresponding dihydropyridazinones in good yields with high enantioselectivities has been developed. Reductive ring opening of the dihydropyridazinones afforded series of cyclic and acyclic gamma-amino acid derivatives in good yields with high enantiopurity.