Primozic, Johann Julius (2024)
Mechanistic Investigation of the Diastereodivergent Asymmetric Allylic Alkylation of Cyclobutenes.
Technische Universität Darmstadt
doi: 10.26083/tuprints-00026531
Dissertation, Erstveröffentlichung, Verlagsversion
Kurzbeschreibung (Abstract)
The Pd-catalyzed asymmetric allylic alkylation of cyclobutenes with stabilized nucleophiles represents a unique example of a diastereodivergent deracemization and de-epimerization. In the present work, a comprehensive mechanistic analysis is reported, encompassing the preparation of putative Pd–allyl intermediates, 1H/31P-NMR reaction monitoring, 2H-labeling studies, ESI-HRMS analysis of reaction mixtures, kinetic rate order determination, and 2H/13C-KIE studies. As a result, an unprecedented mechanistic scenario with a stereochemical dichotomy for both oxidative addition and nucleophilic attack is proposed. Oxidative addition exhibits a convergent course, allowing for de-epimerization to a rapidly interconverting mixture of η1- and η3-coordinated Pd–allyl intermediates with the η1-species as resting states of the reaction. This suprafacial η1–η3–η1 equilibrium enables deracemization via a dynamic kinetic asymmetric transformation type I. Nucleophilic attack of displays a ligand-controlled divergent behavior, establishing a diastereodivergent access to enantioenriched products.
Typ des Eintrags: | Dissertation | ||||
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Erschienen: | 2024 | ||||
Autor(en): | Primozic, Johann Julius | ||||
Art des Eintrags: | Erstveröffentlichung | ||||
Titel: | Mechanistic Investigation of the Diastereodivergent Asymmetric Allylic Alkylation of Cyclobutenes | ||||
Sprache: | Englisch | ||||
Referenten: | Thiele, Prof. Dr. Christina Marie ; Didier, Prof. Dr. Dorian ; Maulide, Prof. Dr. Nuno | ||||
Publikationsjahr: | 7 März 2024 | ||||
Ort: | Darmstadt | ||||
Kollation: | VIII, 301 Seiten | ||||
Datum der mündlichen Prüfung: | 18 Dezember 2023 | ||||
DOI: | 10.26083/tuprints-00026531 | ||||
URL / URN: | https://tuprints.ulb.tu-darmstadt.de/26531 | ||||
Kurzbeschreibung (Abstract): | The Pd-catalyzed asymmetric allylic alkylation of cyclobutenes with stabilized nucleophiles represents a unique example of a diastereodivergent deracemization and de-epimerization. In the present work, a comprehensive mechanistic analysis is reported, encompassing the preparation of putative Pd–allyl intermediates, 1H/31P-NMR reaction monitoring, 2H-labeling studies, ESI-HRMS analysis of reaction mixtures, kinetic rate order determination, and 2H/13C-KIE studies. As a result, an unprecedented mechanistic scenario with a stereochemical dichotomy for both oxidative addition and nucleophilic attack is proposed. Oxidative addition exhibits a convergent course, allowing for de-epimerization to a rapidly interconverting mixture of η1- and η3-coordinated Pd–allyl intermediates with the η1-species as resting states of the reaction. This suprafacial η1–η3–η1 equilibrium enables deracemization via a dynamic kinetic asymmetric transformation type I. Nucleophilic attack of displays a ligand-controlled divergent behavior, establishing a diastereodivergent access to enantioenriched products. |
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Status: | Verlagsversion | ||||
URN: | urn:nbn:de:tuda-tuprints-265315 | ||||
Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 500 Naturwissenschaften und Mathematik > 540 Chemie | ||||
Fachbereich(e)/-gebiet(e): | 07 Fachbereich Chemie 07 Fachbereich Chemie > Clemens-Schöpf-Institut 07 Fachbereich Chemie > Clemens-Schöpf-Institut > Fachgebiet Organische Chemie |
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Hinterlegungsdatum: | 07 Mär 2024 12:36 | ||||
Letzte Änderung: | 08 Mär 2024 11:29 | ||||
PPN: | |||||
Referenten: | Thiele, Prof. Dr. Christina Marie ; Didier, Prof. Dr. Dorian ; Maulide, Prof. Dr. Nuno | ||||
Datum der mündlichen Prüfung / Verteidigung / mdl. Prüfung: | 18 Dezember 2023 | ||||
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