Synthesis of labelled precursors of podophyllotoxin

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dc.contributor.authorPullockaran, Anie Joseen
dc.contributor.committeechairKingston, David G. I.en
dc.contributor.committeememberWolfe, James F.en
dc.contributor.committeememberLewis, Norman G.en
dc.contributor.departmentChemistryen
dc.date.accessioned2014-03-14T21:50:49Zen
dc.date.adate2012-11-29en
dc.date.available2014-03-14T21:50:49Zen
dc.date.issued1989-04-05en
dc.date.rdate2012-11-29en
dc.date.sdate2012-11-29en
dc.description.abstractPodophyllotoxin is an aryltetralin lignan and anticancer agent produced by the <i>Podophyllum</i> and some other species and is extracted from Podophyllin in up to 30 percent yield. Little definitive information is available on the biosynthetic pathways to podophyllotoxin. Administering various specifically labelled precursors into intact plants and tissue cultures can give a much improved insight into the lignan biogenesis. The first part of the work has been to the synthesis of two diastereotopically labelled with ²H at C-4. Desoxypodophyllotoxin is the penultimate intermediate of the podophyllotoxin pathway and specifically labelled compounds can be used for the C-4 hydroxylation studies. Doubly ²H labelled desoxypodophyllotoxin at C-4 was also prepared which can be used for a control experiment. This work also led to the unambiguous assignment of the proton nmr of desoxypodophyllotoxin. A second part of the work has been the synthesis of p-coumarlc acid, a known lignan precursor, doubly labeled with ²H or ²H and ¹³C at the C-3â position. This labeling was selected because the availability of a C-3-labeled monomeric precursor would thus make possible the isolation and study of dimeric compounds labeled at this key positions. These compounds were synthesized, and their identity and stereochemistry were determined by spectroscopic and analytical techniques. The isotopic incorporation of these compounds was 95% d, or d₂ (or greater), as determined by mass spectral analysis.en
dc.description.degreeMaster of Scienceen
dc.format.extentvi, 105 pagesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-11292012-040200en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-11292012-040200/en
dc.identifier.urihttp://hdl.handle.net/10919/46060en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1989.P866.pdfen
dc.relation.isformatofOCLC# 20347077en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1989.P866en
dc.subject.lcshLignansen
dc.titleSynthesis of labelled precursors of podophyllotoxinen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineChemistryen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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