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Title: Applications of DABSO for the delivery of sulfur dioxide in organic synthesis
Author: Deeming, Alex
ISNI:       0000 0004 5366 0846
Awarding Body: University of Oxford
Current Institution: University of Oxford
Date of Award: 2015
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This thesis documents the development of novel synthetic methodologies for the incorporation of sulfur dioxide into organic molecules employing the amine-sulfur dioxide complex DABSO (vide infra). These developed processes serve to access a range of sulfonyl-containing (-SO2-) compounds including sulfones and sulfonamides, via sulfinic acid precursors. Chapter 1 provides an overview of the synthesis and applications of sulfonyl-containing compounds and the organic chemistry of sulfur dioxide. A comprehensive introduction to the developed uses of sulfur dioxide surrogates in organic chemistry is given. The synthetic utility of metal sulfinates towards accessing sulfonyl-containing compounds is also discussed. Chapter 2 details the development of a one-pot sulfone synthesis via metal sulfinates generated from organometallic reagents and DABSO. Alkyl, alkenyl and (hetero)aryl sulfinates prepared from organolithium and Grignard reagents can be efficiently coupled with a range of electrophiles to access a range of products including diaryl, aryl-heteroaryl and β-hydroxy sulfones. Chapter 3 describes an array-compatible, one-pot sulfonamide synthesis employing metal sulfinates and N-chloroamines as in situ-generated intermediates. This employs DABSO and sodium hypochlorite (bleach) as simple reagents and organolithium, organozinc and Grignard reagents along with amines as readily-accessible building blocks. The robust nature of this methodology and its potential application in discovery chemistry is demonstrated with a 65-compound array synthesis. Chapter 4 documents the development of a palladium-catalysed sulfination reaction of boronic acids to access a range of sulfonyl-containing compounds. This involved the establishment of a one-pot/one step synthesis of sulfones leading to the discovery of a redox-neutral, ligand-free sulfination procedure using DABSO and palladium(II) catalysis. Sulfinic acid derivatives can be generated and subsequently trapped in situ with a variety of electrophiles to furnish sulfones and sulfonamides. Chapter 5 summarises the research and the potential future work. Chapter 6 provides experimental details and data.
Supervisor: Willis, Michael Sponsor: Engineering and Physical Sciences Research Council
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Organic synthesis ; organometallic chemistry ; transition metal catalysis