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Title: New strategies for the synthesis and functionalization of aliphatic amines
Author: Trowbridge, Aaron Daniel
ISNI:       0000 0004 7653 6119
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 2019
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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.
Supervisor: Gaunt, Matthew J. Sponsor: Herchel Smith Scholarship
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
Keywords: C-H activation ; transition-metal catalysis ; amines ; photocatalysis ; multicomponent ; alkylamines ; hydroaminoalkylation ; carbonylation ; palladium ; lactam