Continuing exploration of the total chemical synthesis and biological evaluation of potentially anticancer chemotherapeutic members of the ellagitannin family of secondary plant metabolites is proposed. Specifically, concise and sterorational syntheses of the complex dimeric ellagitannins geraniin (DNA topoisomerase II inhibitor), and chebulagic acid (DNA topoisomerase I inhibitor) are planned. These efforts will exploit new synthetic methodology developed in-house for the preparation of the hexahydroxydiphenoyl (HHDP) and dehydrohexahydroxydiphenoyl (DHHDP) moieties featured in these target molecules. Characterization of the immunomodulatroy properties of ellagitannins, gallotannins, and analogs available through syntheses is will continue. Mechanism-of-action investigations at both the molecular and cellular level, coupled with structure/activity studies are designed to reveal the basis for both up-regulation and down - regulation of cytokine (IL-1Beta, TNFAlpha) secretion by certain tannins. Appreciation of the molecular-level details responsible for either triggering or suppressing cytokine release may serve as the basis for designing ellagitannin-inspired chemotherapeutic agents for disease as diverse as cancer septic shock, and cachexia. Finally new strategies for diasteroselective biaryl astropisomer assembly within the context of synthesis efforts directed toward the potent cytotoxic agent diazonamide A will extend current art in this area

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
5R01GM035727-09
Application #
6180381
Study Section
Medicinal Chemistry Study Section (MCHA)
Program Officer
Schwab, John M
Project Start
1986-07-01
Project End
2002-03-31
Budget Start
2000-04-01
Budget End
2001-03-31
Support Year
9
Fiscal Year
2000
Total Cost
$202,765
Indirect Cost
Name
Pennsylvania State University
Department
Chemistry
Type
Schools of Arts and Sciences
DUNS #
City
University Park
State
PA
Country
United States
Zip Code
16802
Feldman, Ken S; Iyer, Malliga R (2005) Allenyl azide cycloaddition chemistry. synthesis of pyrrolidine-containing bicycles and tricycles via the possible intermediacy of azatrimethylenemethane species. J Am Chem Soc 127:4590-1
Feldman, Ken S; Vidulova, Daniela Boneva; Karatjas, Andrew G (2005) Extending Pummerer reaction chemistry. development of a strategy for the regio- and stereoselective oxidative cyclization of 3-(omega-nucleophile)-tethered indoles. J Org Chem 70:6429-40
Feldman, Ken S; Ngernmeesri, Paiboon (2005) Dragmacidin E synthesis studies. Preparation of a model cycloheptannelated indole fragment. Org Lett 7:5449-52
Feldman, Ken S (2005) Recent progress in ellagitannin chemistry. Phytochemistry 66:1984-2000
Feldman, Ken S; Karatjas, Andrew G (2004) Extending Pummerer reaction chemistry. Application to the oxidative cyclization of tryptophan derivatives. Org Lett 6:2849-52
Feldman, Ken S; Vidulova, Daniela Boneva (2004) Extending Pummerer reaction chemistry. Application to the oxidative cyclization of indole derivatives. Org Lett 6:1869-71
Feldman, Ken S; Iyer, Malliga R; Liu, Yanze (2003) Ellagitannin chemistry. Studies on the stability and reactivity of 2,4-HHDP-containing glucopyranose systems. J Org Chem 68:7433-8
Feldman, Ken S; Wilson, Sarah L; Lawlor, Michael D et al. (2002) In vitro and in vivo inhibition of LPS-induced tumor necrosis factor-alpha production by dimeric gallotannin analogues. Bioorg Med Chem 10:47-55
Feldman, Ken S; Eastman, Kyle J; Lessene, Guillaume (2002) Diazonamide synthesis studies: use of Negishi coupling to fashion diazonamide-related biaryls with defined axial chirality. Org Lett 4:3525-8
Feldman, K S; Sahasrabudhe, K; Lawlor, M D et al. (2001) In vitro and In vivo inhibition of LPS-stimulated tumor necrosis factor-alpha secretion by the gallotannin beta-D-pentagalloylglucose. Bioorg Med Chem Lett 11:1813-5

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