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Title: Short, efficient routes towards the synthesis of fluorinated nitrogen heterocycles
Author: Cogswell, Thomas
ISNI:       0000 0004 5365 5086
Awarding Body: University of Glasgow
Current Institution: University of Glasgow
Date of Award: 2015
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Fluorinated compounds make up a large proportion of the output from both the pharmaceutical and agrochemical industries. However, there are still a limited number of methodologies involving the synthesis of such molecules. Six-membered nitrogen containing heterocycles such as pyridines and lactams are key compounds for medicinal chemistry. Therefore, there is much interest into the synthesis of fluorinated nitrogen heterocycle libraries which can be utilised effectively for numerous substrate screens. This thesis aims to produce a novel route for the generation of a host of fluorinated pyridines, lactams and piperidines. Work on non-fluorinated analogues has lead to a rapid two-pot process for the production of dihydropyridones, a potential intermediate for the above targets, starting from common aldehydes. This methodology has been utilised in the synthesis of fluorinated lactams through an efficient ring-closing metathesis protocol of vinyl fluoride compounds. A variety of aldehydes, including aromatic, aliphatic and heterocyclic examples, could be converted in 6 efficient steps into novel fluorinated δ-lactams. The final hydrogenation occurred on the opposite face to the R groups giving a single diasteromer in all cases. Taking inspiration from the δ-lactams series, a synthetic route was designed and implemented to grant access to an array of fluorinated polysubstituted pyrroles. The final step involved a novel addition-aromatisation reaction which allowed late-stage variation of the resulting fluorinated pyrroles. Installation of a hydride, n-butyl, phenyl and allyl moieties could be achieved, all in high yields of 75-93%. Finally the synthesis of a number of interesting benzoxazole containing compounds was undertaken to produce a range of novel fluorinated poly(ADP-ribose) polymerase (PARP) inhibitors, yielding a group of potential anti-cancer agents.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Q Science (General) ; QD Chemistry