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The tandem catalytic asymmetric allene diboration/imine allylation and the asymmetric transition-metal-catalyzed conjugate allylation of activated enonesSieber, Joshua Daniel January 2008 (has links)
Thesis advisor: James P. Morken / Described herein are methods for asymmetric allylation. Chapter 1 describes the scope of the Pd-catalyzed asymmetric diboration of prochiral allenes. The products of this process possess both a chiral allylboronate functional group and a vinylboronate moiety. The allylboronate functionality can subsequently be used for imine allylation, without isolation of the diboron intermediate, resulting in the formation of atypical allylation products through a tandem, one-pot sequence. Furthermore, enantioselection in the catalytic diboration and chirality transfer in the subsequent imine allylation are high; thus, non-racemic, protected homoallylic amines, and other derivatives, are produced in high enantiomeric excess. Chapter 2 describes the discovery and development of a transition-metal-catalyzed asymmetric conjugate allylation of allylboronate ester nucleophiles to activated enones. The scope, utility, and mechanistic aspects of this new reaction are discussed. / Thesis (PhD) — Boston College, 2008. / Submitted to: Boston College. Graduate School of Arts and Sciences. / Discipline: Chemistry.
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