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New strategies for the synthesis and functionalization of aliphatic amines

The invention of catalytic processes that convert feedstock chemicals into pharmacologically-privileged amines is a landmark challenge in organic synthesis. This thesis describes the development of three novel transition-metal catalyzed processes for the synthesis of alkylamines that attempts to meet this challenge. The first Pd-catalyzed methylene β-C−H carbonylation of alkylamines to form substituted β-lactams is reported. Through the synergistic use of a Pd-catalyst and Xanpthos ligand, secondary amines underwent exclusive methylene β-C−H activation in high yields and diastereoselectivities. Subsequently, the development of a remarkably selective methylene β-C−H carbonylation of α-tertiary amines (ATAs), is detailed. This methodology enables the C−H carbonylation of methylene C−H bonds over traditionally more reactive methyl and C(sp2)−H bonds. Importantly, a range of functional groups previously incompatible with C−H technologies were tolerated in good yields. Finally, the development of a novel multicomponent synthesis of tertiary amines is described. The novel photocatalytic single-electron reduction of alkyl iminium ions furnishes -amino radicals that engage alkenes forming a new C-C bond. The reaction exhibits broad functional group tolerance and enables the synthesis of amines not readily accessible by existing methods.

Identiferoai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:763868
Date January 2019
CreatorsTrowbridge, Aaron Daniel
ContributorsGaunt, Matthew J.
PublisherUniversity of Cambridge
Source SetsEthos UK
Detected LanguageEnglish
TypeElectronic Thesis or Dissertation
Sourcehttps://www.repository.cam.ac.uk/handle/1810/287941

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