Carbon−Hydrogen Bond Functionalization using Removable Monodentate Directing Groups

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dc.contributor.advisorDaugulis, Olafs
dc.contributor.committeeMemberGilbertson, Scott R.
dc.contributor.committeeMemberCai, Chengzhi
dc.contributor.committeeMemberChen, Tai-Yen
dc.contributor.committeeMemberCuny, Gregory D.
dc.creatorkwak, sehun
dc.date.accessioned2022-06-30T23:41:03Z
dc.date.createdAugust 2020
dc.date.issued2020-08
dc.date.submittedAugust 2020
dc.date.updated2022-06-30T23:41:04Z
dc.description.abstractChapter 1: 3,5-Dimethylpyrazole was employed as a mono-dentate directing group for palladium-catalyzed ortho-sp2 C−H arylation with aryl iodides. The reaction shows good functional group tolerance and outstanding selectivity for mono-ortho-arylation. Ozonolysis of ortho-arylated arylpyrazoles gave acylated biphenylamines that were further arylated to afford unsymmetrically substituted 2,6-diarylacetanilides. Chapter 2: N-Aminopyridinium ylides were used as mono-dentate directing groups for copper-promoted C−H/N−H coupling of sp2 C−H bonds with pyrazoles, imidazoles, and sulfonamides. Reactions proceed in fluorinated alcohol solvents at elevated temperatures and require use of 1.3−3 equiv of copper(II) acetate. This appears to be the first method for copper-promoted C−H/N−H coupling directed by a removable monodentate auxiliary in absence of added ligands. Chapter 3: N-Aminopyridinium ylides are competent monodentate directing groups for cobalt-catalyzed annulation of sp2 C−H bonds with internal alkynes. Pyridine moiety in ylide serves as an internal oxidant and is cleaved during the reaction. The annulation reactions possess excellent compatibility with heterocyclic substrates, tolerating furan, thiophene, pyridine, pyrrole, pyrazole, and indole functionalities.
dc.description.departmentChemistry, Department of
dc.format.digitalOriginborn digital
dc.format.mimetypeapplication/pdf
dc.identifier.citationPortions of this document appear in: Kwak, S. H.; Gulia, N.; Daugulis, O. Synthesis of Unsymmetrical 2,6-Diarylanilines by Palladium-Catalyzed C–H Bond Functionalization Methodology. J. Org. Chem. 2018, 83, 5844–5850; and in: Kwak, S. H.; Daugulis, O. N-Aminopyridinium Ylide-Directed, Copper-Promoted Amination of sp2 C–H Bonds. J. Org. Chem. 2019, 84, 13022–13032.
dc.identifier.urihttps://hdl.handle.net/10657/10257
dc.language.isoeng
dc.rightsThe author of this work is the copyright owner. UH Libraries and the Texas Digital Library have their permission to store and provide access to this work. UH Libraries has secured permission to reproduce any and all previously published materials contained in the work. Further transmission, reproduction, or presentation of this work is prohibited except with permission of the author(s).
dc.subjectC-H bond activation
dc.subjectmonodentate directing group
dc.titleCarbon−Hydrogen Bond Functionalization using Removable Monodentate Directing Groups
dc.type.dcmiText
dc.type.genreThesis
local.embargo.lift2022-08-01
local.embargo.terms2022-08-01
thesis.degree.collegeCollege of Natural Sciences and Mathematics
thesis.degree.departmentChemistry, Department of
thesis.degree.disciplineChemistry
thesis.degree.grantorUniversity of Houston
thesis.degree.levelDoctoral
thesis.degree.nameDoctor of Philosophy

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