Total synthesis and biological evaluation of the nakijiquinones
Autor: | Lars Kissau, Ralph Mazitschek, Pascal Furet, Petra Stahl, Herbert Waldmann, Athanassios Giannis, Axel Huwe |
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Rok vydání: | 2001 |
Předmět: |
Models
Molecular Stereochemistry Receptor ErbB-2 Alkylation Biochemistry Catalysis Receptor tyrosine kinase Substrate Specificity chemistry.chemical_compound Colloid and Surface Chemistry Amide Receptors Growth Factor Enzyme Inhibitors chemistry.chemical_classification Binding Sites biology Aryl Enantioselective synthesis Quinones Total synthesis Receptor Protein-Tyrosine Kinases Stereoisomerism General Chemistry Amino acid Receptors Vascular Endothelial Growth Factor chemistry biology.protein Enone Sesquiterpenes |
Zdroj: | Journal of the American Chemical Society. 123(47) |
ISSN: | 0002-7863 |
Popis: | The Her-2/Neu receptor tyrosine kinase is vastly overexpressed in about 30% of primary breast, ovary, and gastric carcinomas. The nakijiquinones are the only naturally occurring inhibitors of this important oncogene, and structural analogues of the nakijiquinones may display inhibitory properties toward other receptor tyrosine kinases involved in cell signaling and proliferation. Here, we describe the first enantioselective synthesis of the nakijiquinones. Key elements of the synthesis are (i) the reductive alkylation of a Wieland-Miescher-type enone with a tetramethoxyaryl bromide, (ii) the oxidative conversion of the aryl ring into a p-quinoid system, (iii) the regioselective saponification of one of the two vinylogous esters incorporated therein, and (iv) the selective introduction of different amino acids via nucleophilic conversion of the remaining vinylogous ester into the corresponding vinylogous amide. The correct stereochemistry and substitution patterns are completed by conversion of two keto groups into a methyl group and an endocyclic olefin via olefination/reduction and olefination/isomerization sequences, respectively. This synthesis route also gave access to analogues of nakijiquinone C with inverted configuration at C-2 or with an exocyclic instead of an endocyclic double bond. Investigation of the kinase-inhibiting properties of the synthesized derivatives revealed that the C-2 epimer 30 of nakijiquinone C is a potent and selective inhibitor of the KDR receptor, a receptor tyrosine kinase involved in tumor angiogenesis. Molecular modeling studies based on the crystal structure of KDR and a model of the ATP binding site built from a crystal structure of FGF-R revealed an insight into the structural basis for the difference in activity between the natural product nakijiquinone C and the C-2 epimer 30. |
Databáze: | OpenAIRE |
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