eprintid: 16975 rev_number: 16 userid: 1397 dir: disk0/00/01/69/75 datestamp: 2013-07-02 14:39:48 lastmod: 2016-11-15 14:08:27 status_changed: 2013-07-02 14:39:48 type: thesis_degree metadata_visibility: show contact_email: crosenker@mac.com item_issues_count: 0 eprint_status: archive creators_name: Rosenker, Christopher J creators_email: crosenker@mac.com title: Studies and Synthesis of Syringolin A, Functionalized Thiadiazines, and Thiol Additions to Enones ispublished: unpub divisions: sch_as_chemistry full_text_status: public keywords: Syringolin Total Synthesis Heterocycles Thiadiazine Thiol conjugate addition Enone addition equilibrium abstract: Part one of this dissertation describes the formal synthesis of syringolin A. Syringolin A contains a unique 12-membered dipeptide core and has been shown to be a potent irreversible proteasome inhibitor. Completion of the formal synthesis of syringolin A was facilitated by the rapid access to non-proteinogenic α,β-unsaturated-γ-amino acid and α-amino acid fragments with complete stereochemical control utilizing the stereoselective addition of alkenylorganometallic reagents to chiral N-tert-butanesulfinylimines. Part two discusses the development of a robust strategy for the preparation and selective functionalization of heterocyclic thiadiazines with four points of diversity. Hydrolysis of the pendant C-4 ester and functionalization of the resulting acid provided access to a small library of highly substituted thiadiazine analogues that exhibit favorable physicochemical properties for drug-like compounds. Part three describes the investigation of the equilibria of thiophenol conjugate additions to enone-containing indole scaffolds. Our studies indicate that mono-β-substituted enones form thermodynamically favorable adducts with thiophenol. We also found that thiol eliminations to form enones are favorable in the presence of DBU but not Et3N. These experiments suggest that mono-β-substituted enones could be used as irreversible covalent protein modifiers. date: 2013-07-02 date_type: published pages: 196 institution: University of Pittsburgh refereed: TRUE etdcommittee_type: committee_chair etdcommittee_type: committee_member etdcommittee_type: committee_member etdcommittee_type: committee_member etdcommittee_name: Wipf, Peter etdcommittee_name: Day, Billy W etdcommittee_name: Nelson, Scott G etdcommittee_name: Gold, Barry etdcommittee_email: pwipf@pitt.edu etdcommittee_email: bday@pitt.edu etdcommittee_email: sgnelson@pitt.edu etdcommittee_email: goldbi@pitt.edu etdcommittee_id: PWIPF etdcommittee_id: BDAY etdcommittee_id: SGNELSON etdcommittee_id: GOLDBI etd_defense_date: 2012-12-10 etd_approval_date: 2013-07-02 etd_submission_date: 2012-12-13 etd_release_date: 2013-07-02 etd_access_restriction: immediate etd_patent_pending: FALSE thesis_type: dissertation degree: PhD citation: Rosenker, Christopher J (2013) Studies and Synthesis of Syringolin A, Functionalized Thiadiazines, and Thiol Additions to Enones. Doctoral Dissertation, University of Pittsburgh. (Unpublished) document_url: http://d-scholarship-dev.library.pitt.edu/16975/4/Rosenker_ETD_2013.pdf