Index Catalog // ScholarsArchive@OSU

Evidence for a stepwise mechanism in the cycloreversion of rhenium diolates

Creator:: Ness, Stephanie L.
Resource Type:: Masters Thesis
Full Text:: Evidence for a stepwise mechanism in the cycloreversion of

Synthetic studies on indolic enamide natural products: 1. Total syntheses of coscinamide A, concinamide B and igzamide: 2. Synthetic studies towards the synthesis of halocyamine B

Creator:: Ma, Yuelong
Abstract:: The 3-substituded indolic enamide moiety has been found in many marine compounds over the past 20 years. These indolic enamides exhibit various biological properties such as cytotoxic, anthelmintic, antimicrobial and HW-inhibitory activities. Among these indolic enamides, some are (E)-enamides, like coscinamide A and coscinamide B, others are (Z)-configuration in their...
Resource Type:: Masters Thesis
Full Text:: Studies on Indolic Enamide Natural Products: 1. Total BYntheses of Coscinamide A, Concinamide B and

Designing chiral rhenium (VII) trioxo complexes

Creator:: Juniku, Rajan B.
Abstract:: The epoxide deoxygenation reaction is formally the reverse of theepoxidation reaction. Compared to epoxidation, which has reached its fullmaturity, epoxide deoxygenation has not been as intensively developed.Among the few deoxygenation reagents, a handful are catalytic in a metalcomplex, show high stereospecificity and operate under mild conditions. Acommon feature of all...
Resource Type:: Masters Thesis
Full Text:: ) Trioxo Complexes. Abstract Atrnroved: Kevin P. Gable The epoxide deoxygenation reaction is formally

Direct atom transfer vs. ring expansion in reaction of rhenium oxo complexes with cyclooctene epoxides and episulfides

Creator:: Khownium, Kriangsak
Abstract:: The rhenium (V) complex Tp'ReO₂ (Tp' = hydrido-tris-(3,5- dimethylpyrazolyl)borate), generated in situ from PPh₃ reduction of Tp'Re0₃, reacts with small ring heterocycles such as epoxides and episulf ides. The strained trans-cyclooctene ring provides an unusual thermodynamic bias against direct atom transfer, but trans-cyclooctene oxide still produces substantial amounts of trans-cyclooctene....
Resource Type:: Masters Thesis
Full Text:: show a greater propensity for direct atom transfer; under catalytic conditions the eventual products

Synthesis, characterization, and reactivity of rhenium dithiodiolate and monothiodiolate complexes

Creator:: Chuawong, Pitak
Abstract:: The rhenium dithiodiolate, Hydrido-tris-(3 ,5-dimethyl- 1 -pyrazol yl) borato(ethane- 1 ,2-dithiodiolato)(oxo)rheni um(V), and Hydrido-tris-(3 ,5-dimethyl- 1 -pyrazolyl)borato(phenylethanedithiodiolato)(oxo)rhenium(V), were synthesized by reductive cyclocondensation of alkane-1,2-dithiols with Tp'Re0₃ in a one pot fashion. The rhemium monothiodiolate, Hydrido-tris-(3 ,5-dimethyl- 1 -pyrazolyl) borato(ethane- 1 ,2-monothiodiolato)(oxo)rhenium(V), and Hydrido-tris-(3 ,5- dimethyl- 1 -pyrazolyl)borato(propanemonothiodiolato)(oxo)rhenium(V), were also synthesized...
Resource Type:: Masters Thesis
Full Text:: Reactivity of Rhenium Dithiodiolate and Monothiodiolate Complexes. Abstract Approved: Kevin P. Gable The

Mechanistic studies of metal oxide mediated oxidation via kinetic isotope analysis of pentamethylcyclopentadienyl rhenium diolate cycloreversion

Creator:: Phan, Thuy N.
Resource Type:: Masters Thesis
Full Text:: Analysis of Pentamethylcyclopentadienyl Rhenium Diolate Cyclo reve rs ion Abstract approved: Kevin P

Towards the Perfect Marriage Between Theory and Experiments in Drug Discovery and Synthesis : Insights into Structure Determination of Complex Natural Products and Mechanistic Understandings of Lactam Synthesis

Creator:: Snyder, Kevin M.
Abstract:: In this report, three studies are presented that aid in the development of drug discovery and their synthesis. In each, the importance of the marriage between computations and experiments is highlighted. Continued efforts in this vein are essential for future efforts towards improving human health. The first case study investigated...
Resource Type:: Masters Thesis
Full Text:: : Mandelalides and Coibamide A Kevin M. Snyder, Dr. Justyna Sikorska, Prof. Tao Ye, Prof. Lijing Fang, Prof

Catalytic desymmetrization of D₂d̳-symmertic proprochiral tetrasubstituted biphenyl compounds: a novel approach to the synthesis of axially chiral C₂-symmetric molecules

Creator:: Gunderson, Jeremey Tyson
Abstract:: Many D2d-symmetric 2,2',6,6'-tetrasubstituted biphenyls are readily prepared via net oxidative dimerization of appropriate 1,3-disubstituted benzenes. Conversion of such proprochiral compounds to useful C2-symmetric chiral biphenyls requires formal replacement of two substituents on opposing aryl ring units with alternate groups. This under exploited desymmetrization tactic has been demonstrated for the generation...
Resource Type:: Masters Thesis
Full Text:: Tetrasubstituted Biphenyl Compounds: A Novel Approach to the Synthesis of Axially Chiral C2 Symmetric Molecules

Analysis of the mechanism of sulfoxide-lithium exchange and the reactive intermediate in stereospecific reagent-controlled homologation (StReCH)

Creator:: Hoyt, Amanda
Abstract:: The stereospecific reagent-controlled homologation (StReCH) of boronic esters with enantioenriched carbenoid species generated in situ by the addition of organolithium initiators to stereodefined α-chloroalkyl aryl sulfoxides was previously reported. The reaction of an organolithium with an α-chloroalkyl aryl sulfoxide ostensibly generates an α-chloroalkyllithium via sulfoxide-lithium exchange; however, the true nature...
Resource Type:: Masters Thesis
Full Text:: chlorosulfoxide-based StReCH is not certain. It may be: an α- chloroalkyllithium, a sulfurane intermediate en

Development of organocatalyzed, intramolecular heteroatom Michael addition and application towards alkaloid synthesis

Creator:: Carlson, Erik
Abstract:: Effective methods for the enantiopure formation of substituted piperidine rings are significantly important due to their presence in alkaloid products. A valuable method to form these ring systems would be via an intramolecular heteroatom Michael addition from the corresponding enone or enal. Described herein is a methodolgy that has been...
Resource Type:: Masters Thesis
Full Text:: substituted piperidine rings are significantly important due to their presence in alkaloid products. A

ScholarsArchive@OSU

Evidence for a stepwise mechanism in the cycloreversion of rhenium diolates

Synthetic studies on indolic enamide natural products: 1. Total syntheses of coscinamide A, concinamide B and igzamide: 2. Synthetic studies towards the synthesis of halocyamine B

Designing chiral rhenium (VII) trioxo complexes

Direct atom transfer vs. ring expansion in reaction of rhenium oxo complexes with cyclooctene epoxides and episulfides

Synthesis, characterization, and reactivity of rhenium dithiodiolate and monothiodiolate complexes

Mechanistic studies of metal oxide mediated oxidation via kinetic isotope analysis of pentamethylcyclopentadienyl rhenium diolate cycloreversion

Towards the Perfect Marriage Between Theory and Experiments in Drug Discovery and Synthesis : Insights into Structure Determination of Complex Natural Products and Mechanistic Understandings of Lactam Synthesis

Catalytic desymmetrization of D₂d̳-symmertic proprochiral tetrasubstituted biphenyl compounds: a novel approach to the synthesis of axially chiral C₂-symmetric molecules

Analysis of the mechanism of sulfoxide-lithium exchange and the reactive intermediate in stereospecific reagent-controlled homologation (StReCH)

Development of organocatalyzed, intramolecular heteroatom Michael addition and application towards alkaloid synthesis

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