This study subjected the 4,4-disubstituted-2-carboxamide-2-cyclohexenone Birch-Cope products to carbon nucleophile conjugate additions to enantioselectively generate vicinal quaternary-tertiary stereocenters. Intermolecular conjugate additions were studied extensively but were unfortunately limited in scope. It is hypothesized that steric congestion around the enone from the chiral auxiliary and the vicinal quaternary carbon contributed to these difficulties. Because our lab has previously reported on ring forming intramolecular conjugate addition reactions with oxygen,1 nitrogen,2 and carbon3 nucleophiles, intramolecular Friedel-Crafts alkylations were explored. These conjugate additions have enantioselectively formed 6-6-6 and 6-5-6 tricarbocyclic ring systems. The framework of multiple tetracyclic diterpenes has also been achieved through chiral auxiliary removal on the Friedel-Crafts products followed by regioselective enol silane formation and palladium-catalyzedcycloalkenylation4,5 to form the bicyclo[3.2.1]octane core.
","abstract_html":"<p>This study subjected the 4,4-disubstituted-2-carboxamide-2-cyclohexenone Birch-Cope products to carbon nucleophile conjugate additions to enantioselectively generate vicinal quaternary-tertiary stereocenters. Intermolecular conjugate additions were studied extensively but were unfortunately limited in scope. It is hypothesized that steric congestion around the enone from the chiral auxiliary and the vicinal quaternary carbon contributed to these difficulties. Because our lab has previously reported on ring forming intramolecular conjugate addition reactions with oxygen,<sup>1</sup> nitrogen,<sup>2</sup> and carbon<sup>3</sup> nucleophiles, intramolecular Friedel-Crafts alkylations were explored. These conjugate additions have enantioselectively formed 6-6-6 and 6-5-6 tricarbocyclic ring systems. The framework of multiple tetracyclic diterpenes has also been achieved through chiral auxiliary removal on the Friedel-Crafts products followed by regioselective enol silane formation and palladium-catalyzedcycloalkenylation<sup>4,5</sup> to form the bicyclo[3.2.1]octane core.</p>","abstract_has_math":false,"creators":["Burke, Sarah"],"institution":null,"degree_name":"Doctor of Philosophy (PhD)","degree_level":"Bryn Mawr only","degree_discipline":"Chemistry","degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2014,"date_issued":"2014-01-01T08:00:00Z","date_published":"2014-01-01T08:00:00Z","updated_at":"2026-07-24T01:23:36Z","subjects":[],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://repository.brynmawr.edu/dissertations/101","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Burke, Sarah"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.available","label":"Dc Date Available","values":["2014-04-01T07:00:00Z"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Chemistry"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Bryn Mawr only"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Doctor of Philosophy (PhD)"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://repository.brynmawr.edu/dissertations/101"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["This study subjected the 4,4-disubstituted-2-carboxamide-2-cyclohexenone Birch-Cope products to carbon nucleophile conjugate additions to enantioselectively generate vicinal quaternary-tertiary stereocenters. Intermolecular conjugate additions were studied extensively but were unfortunately limited in scope. It is hypothesized that steric congestion around the enone from the chiral auxiliary and the vicinal quaternary carbon contributed to these difficulties. Because our lab has previously reported on ring forming intramolecular conjugate addition reactions with oxygen,1 nitrogen,2 and carbon3 nucleophiles, intramolecular Friedel-Crafts alkylations were explored. These conjugate additions have enantioselectively formed 6-6-6 and 6-5-6 tricarbocyclic ring systems. The framework of multiple tetracyclic diterpenes has also been achieved through chiral auxiliary removal on the Friedel-Crafts products followed by regioselective enol silane formation and palladium-catalyzedcycloalkenylation4,5 to form the bicyclo[3.2.1]octane core.
"]},{"key":"dc:title","label":"Title","values":["Enantioselective Conjugate Additions to a Hindered Cyclohexenone System"]}]}],"canonical_facts":{"dc:creator":["Burke, Sarah"],"dc:date.available":["2014-04-01T07:00:00Z"],"dc:description.abstract":["This study subjected the 4,4-disubstituted-2-carboxamide-2-cyclohexenone Birch-Cope products to carbon nucleophile conjugate additions to enantioselectively generate vicinal quaternary-tertiary stereocenters. Intermolecular conjugate additions were studied extensively but were unfortunately limited in scope. It is hypothesized that steric congestion around the enone from the chiral auxiliary and the vicinal quaternary carbon contributed to these difficulties. Because our lab has previously reported on ring forming intramolecular conjugate addition reactions with oxygen,1 nitrogen,2 and carbon3 nucleophiles, intramolecular Friedel-Crafts alkylations were explored. These conjugate additions have enantioselectively formed 6-6-6 and 6-5-6 tricarbocyclic ring systems. The framework of multiple tetracyclic diterpenes has also been achieved through chiral auxiliary removal on the Friedel-Crafts products followed by regioselective enol silane formation and palladium-catalyzedcycloalkenylation4,5 to form the bicyclo[3.2.1]octane core.
"],"dc:identifier":["https://repository.brynmawr.edu/dissertations/101"],"dc:title":["Enantioselective Conjugate Additions to a Hindered Cyclohexenone System"],"thesis:degree_discipline":["Chemistry"],"thesis:degree_level":["Bryn Mawr only"],"thesis:degree_name":["Doctor of Philosophy (PhD)"]},"updated_at":"2026-07-24T01:23:36Z"}