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fbtwitterlinkedinvimeoflicker grey 14rssslideshare1
Languages: English
Types: Doctoral thesis
Subjects: QD

Classified by OpenAIRE into

mesheuropmc: humanities
The a-hydroxy carbonyl group represents a significant building block in organic synthesis, which is reflected by the extensive synthetic efforts directed towards introduction of this group in a chemo- regio-, stereo-, and enantioselective manner. Traditional methods for the a-oxygenation of carbonyl compounds involve the formation and reaction of air-sensitive intermediates. This thesis describes an alternative metal-free approach to the formation of C-O bonds a- to a carbonyl group, in an asymmetric manner. Chapter l provides an overview of the literature methods for the a-oxygenation of carbonyl compounds, incorporating recent advances in this field achieved previously within the group, following discovery of 63*HC1 to affect a one-pot a-oxygenation transformation. Chapter 2 outlines our objectives and describes methods for the preparation of chiral hydroxylamine reagents based on the generic structure 108. The focus of this chapter is on establishing asymmetric transformations and their optimisation. Chapter 3 examines varying the size and nature of the 0-acyl group (R2) in order to determine its effect on the asymmetric reaction. Chapter 4 studies the influence of relative electronic effects on the asymmetric reaction, by varying the electronic properties of R1 and R2. Chapter 5 explores the role of the TV-substituent (R1) on an asymmetric a-oxyacylation transformation. Application of our methodology to other carbonyl substrates is also examined. Chapter 6 investigates an alternative method for the synthesis of chiral a-oxygenated carbonyl compounds, involving formation and reaction of chiral nitrones. In recent years methods have been developed within the group for the a-oxycarbonoylation, oxycarbamoylation and oxytosylation of carbonyl compounds. Chapter 7 investigates application of the methodology developed within this thesis to each of these transformations. Following an interesting observation, a novel procedure for the conversion of primary amines into ketones was developed, which is discussed in Chapter 8.
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    • 5.3.1. Optimisation of Reaction Conditions.
    • 5.3.2. Variation of 0-A cyl Group.
    • 5.4. Application to Other Cyclic Ketone Substrates.
    • 5.5. Conclusion.
    • 8.2. Novel Metal-Free Method for the Oxidation of Primary Amines. 161
    • 8.3. Development of a One-Pot Procedure. 168
    • 8.4. Conclusion. 170
    • Chapter 9. Experimental. 9.1. Reagent Experimentals. 9.1.1. General Procedure 1. 9.1.1.1. Synthesis of pH 10.5 Buffer. 9.1.1.2. Conversion to HC1 Salt. 9.1.2. General Procedure 2. 9.1.3. Experimantal Data. 9.2. a-Oxygenated Product Experimentals. 9.2.1. General Procedure 3. 9.2.2. Experimental Data. 9.2.3. Synthesis of 33 from Nitrone 281. 9.2.4. One-Pot Procedure for the Synthesis of 33 from Nitrone 281. 9.3. Ketone Experimentals. 9.3.1. General Procedure 4. 9.3.2. General Procedure 5. 9 .3 3 . Experimental Data.
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