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dc.contributor.authorO'Hagan, David
dc.contributor.authorRzepa, Henry S.
dc.contributor.authorSchuler, Martin
dc.contributor.authorSlawin, Alexandra M. Z.
dc.date.accessioned2013-12-05T11:01:01Z
dc.date.available2013-12-05T11:01:01Z
dc.date.issued2006-10-02
dc.identifier.citationO'Hagan , D , Rzepa , H S , Schuler , M & Slawin , A M Z 2006 , ' The vicinal difluoro motif : the synthesis and conformation of erythro- and threo-diastereoisomers of 1,2-difluorodiphenylethanes, 2,3-difluorosuccinic acids and their derivatives ' , Beilstein Journal of Organic Chemistry , vol. 2 , 19 . https://doi.org/10.1186/1860-5397-2-19en
dc.identifier.otherPURE: 667704
dc.identifier.otherPURE UUID: db347faf-0d41-495d-aac3-65ca82931fc8
dc.identifier.otherWOS: 000241928200001
dc.identifier.otherScopus: 33750973914
dc.identifier.otherORCID: /0000-0002-9527-6418/work/56861633
dc.identifier.urihttp://hdl.handle.net/10023/4265
dc.description.abstractBackground: It is well established that vicinal fluorines (RCHF-CHFR) prefer to adopt a gauche rather than an anti conformation when placed along aliphatic chains. This has been particularly recognised for 1,2-difluoroethane and extends to 2,3-difluorobutane and longer alkyl chains. It follows in these latter cases that if erythro and threo vicinal difluorinated stereoisomers are compared, they will adopt different overall conformations if the fluorines prefer to be gauche in each case. This concept is explored in this paper with erythro- and threo- diastereoisomers of 2,3-difluorosuccinates. Results: A synthetic route to 2,3-difluorosuccinates has been developed through erythro- and threo- 1,2-difluoro-1,2-diphenylethane which involved the oxidation of the aryl rings to generate the corresponding 2,3- difluorosuccinic acids. Ester and amide derivatives of the erythro- and threo- 2,3-difluorosuccinic acids were then prepared. The solid and solution state conformation of these compounds was assessed by X-ray crystallography and NMR. Ab initio calculations were also carried out to model the conformation of erythro- and threo- 1,2-difluoro-1,2-diphenylethane as these differed from the 2,3-difluorosuccinates. Conclusion: In general the overall chain conformations of the 2,3-difluorosuccinates diastereoisomers were found to be influenced by the fluorine gauche effect. The study highlights the prospects of utilising the vicinal difluorine motif (RCHF-CHFR) as a tool for influencing the conformation of performance organic molecules and particularly tuning conformation by selecting specific diastereoisomers (erythro or threo).
dc.format.extent13
dc.language.isoeng
dc.relation.ispartofBeilstein Journal of Organic Chemistryen
dc.rights© 2006 O'Hagan et al; licensee Beilstein-Institut.This is an Open Access article under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The license is subject to the Beilstein Journal of Organic Chemistry terms and conditions: (http://www.beilstein-journals.org/bjoc)en
dc.subjectPEPTIDASE-IV INHIBITORSen
dc.subjectBIS(2-METHOXYETHYL)AMINOSULFUR TRIFLUORIDEen
dc.subjectCOUPLING-CONSTANTSen
dc.subjectFLUORINATIONen
dc.subjectSTABILITYen
dc.subjectPYRROLIDINEen
dc.subjectHYDROGENen
dc.subjectSOLVENTen
dc.subjectREAGENTen
dc.subjectQD Chemistryen
dc.subject.lccQDen
dc.titleThe vicinal difluoro motif : the synthesis and conformation of erythro- and threo-diastereoisomers of 1,2-difluorodiphenylethanes, 2,3-difluorosuccinic acids and their derivativesen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews.School of Chemistryen
dc.contributor.institutionUniversity of St Andrews.EaSTCHEMen
dc.identifier.doihttps://doi.org/10.1186/1860-5397-2-19
dc.description.statusPeer revieweden
dc.identifier.urlhttp://www.scopus.com/inward/record.url?scp=33750973914&partnerID=8YFLogxKen


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