Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 27, Issue 64, Pages 16000-16005Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202102819
Keywords
aryl hydrogenation; fluorocyclohexanes; Janus motif; organic chemistry; organofluorine chemistry
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Funding
- EPSRC [EP/R013799/1]
- EPSRC CRITICAT CDT programme
- Chinese Scholarship Council
- EPSRC [EP/R013799/1] Funding Source: UKRI
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This study introduces monoalkylated derivatives containing the polar all-cis 2,3,4,5,6-pentafluorocyclohexyl (Janus face) motif, and demonstrates their conversion to various compounds, including representative members of antiviral compounds.
Monoalkylated derivatives of the unusually polar all-cis 2,3,4,5,6- pentafluorocyclohexyl (Janus face) motif are prepared starting from an aryl hydrogenation of 2,3,4,5,6- pentafluorophenylacetate methyl ester 15. The method used Zeng's Rh(CAAC) carbene catalyst 4 in the hydrogenation following the protocol developed by Glorius. The resultant Janus pentafluorocyclohexylacetate methyl ester 16 was converted to the corresponding alcohol 18, aldehyde 13, bromide 29 and azide 14 through functional group manipulations, and some of these building blocks were used in Ugi-multicomponent and Cu-catalysed click reactions. NBoc protected pentafluoroarylphenylalanine methyl ester 35 was also subject to an aryl hydrogenation, and then deprotection to generate the Janus face beta-pentafluorocyclohexyl-alanine amino acid 15, which was incorporated into representative members of an emerging class of candidate antiviral compounds. Log P measurements demonstrate that the all-cis 2,3,4,5,6-pentafluorocyclohexyl ring system is more polar than a phenyl ring. In overview the paper introduces new building blocks containing this Janus ring and demonstrates their progression to molecules typically used in bioactives discovery programmes.
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