Total syntheses of ?-lactone containing natural products: I. total synthesis of belactosin C II. synthetic studies toward spongiolactone
dc.contributor.advisor | Gabbai, Francois P. | |
dc.contributor.advisor | Romo, Daniel | |
dc.creator | Cho, Sung Wook | |
dc.date.accessioned | 2010-01-15T00:13:15Z | |
dc.date.accessioned | 2010-01-16T01:19:39Z | |
dc.date.available | 2010-01-15T00:13:15Z | |
dc.date.available | 2010-01-16T01:19:39Z | |
dc.date.created | 2008-12 | |
dc.date.issued | 2009-05-15 | |
dc.identifier.uri | https://hdl.handle.net/1969.1/ETD-TAMU-3121 | |
dc.description.abstract | The recently isolated bacterial metabolites, belactosins A-C from a fermentation broth of Streptomyces sp. UCK14, uniquely contain a β-lactone dipeptide motif and exhibit anticancer activities. The enantioselective synthesis of (-)-belactosin C and derivatives was accomplished in a concise manner employing the tandem, Mukaiyama aldol-lactonizaton (TMAL) process and test their bioactivities. . One approach involved a distal double diastereoselective TMAL reaction with a dipeptide glyoxamide, whereas a second approach involved amide coupling of a dipeptide with a β-lactone carboxylic acid, obtained via the TMAL process employing a chiral silyl ketene acetal. Enzymatic assays showed that the belactosins act as the dual inhibitors of the proteasome and the thioesterase domain of fatty acid synthase. Spongiolactone which uniquely contains a cyclopentyl-fused β-lactone was isolated in 1986 from Spongi-onellagracilis No biological activity have been reported for this compound; however, the acylating potential of the resident β-lactone warrants screening for potential activity. After many setbacks in the synthesis of spongiolactone, significant progress has been made. Importantly, NCAL process also enabled a concise construction of [3.2.0]-bicyclo β-lactone, which is the key structure in the spongiolactone synthesis and only a few steps remained to complete the synthesis. | en |
dc.format.medium | electronic | en |
dc.format.mimetype | application/pdf | |
dc.language.iso | en_US | |
dc.subject | Belactosin C | en |
dc.subject | TMAL | en |
dc.subject | Spongiolactone | en |
dc.subject | NCAL | en |
dc.subject | β-Lactone | en |
dc.subject | Synthesis | en |
dc.title | Total syntheses of ?-lactone containing natural products: I. total synthesis of belactosin C II. synthetic studies toward spongiolactone | en |
dc.type | Book | en |
dc.type | Thesis | en |
thesis.degree.department | Chemistry | en |
thesis.degree.discipline | Chemistry | en |
thesis.degree.grantor | Texas A&M University | en |
thesis.degree.name | Doctor of Philosophy | en |
thesis.degree.level | Doctoral | en |
dc.contributor.committeeMember | Hong, Donghyun | |
dc.contributor.committeeMember | Singleton, Daniel A. | |
dc.type.genre | Electronic Dissertation | en |
dc.type.material | text | en |
dc.format.digitalOrigin | born digital | en |
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Texas A&M University Theses, Dissertations, and Records of Study (2002– )