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New Strategies for Synthesis with Boronate Esters

TAJUDDIN, HAZMI (2013) New Strategies for Synthesis with Boronate Esters. Doctoral thesis, Durham University.

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Aryl and alkyl boronic acids and their derivatives have a broad variety of applications, ranging from uses in medicines to cross-coupling partners in modern organic synthesis. This thesis presents the work undertaken in both the synthetic and application aspects of this important class of synthetic intermediates.

Chapter 1 gives a brief overview on the bonding and physical properties of boronic acids, their synthesis and applications.

Chapter 2 shows that the activation of C-H bonds in the iridium-catalysed borylation of arenes is contingent on C-H acidity in the absence of steric effects, allowing for the prediction of regiochemistry through a simple 1H NMR analysis of the starting material.

Chapter 3 shows that the high electronic barrier hindering the borylation of C-H bonds alpha to a pyridyl nitrogen can be overcome through steric effects, and that the resultant α-pyridyl boronate can be used, in-situ, in Suzuki-Miyaura cross-coupling reactions.

Chapter 4 describes the development of C-H borylation/1,4-conjugate addition sequence, for the synthesis of β-aryl ketones and the corresponding alcohols under reducing conditions.

Chapter 5 describes the development of a new methodology for the preparation of alkyl boronate esters through copper-catalysed borylation of alkyl halides.

Item Type:Thesis (Doctoral)
Award:Doctor of Philosophy
Keywords:Borylation Conjugate Addition Arylboronates Alkylboronates Pyridines Iridium C-H Activation Copper pinacol ester boronic acid
Faculty and Department:Faculty of Science > Chemistry, Department of
Thesis Date:2013
Copyright:Copyright of this thesis is held by the author
Deposited On:08 May 2013 15:10

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