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    The Preparation and Absolute Configurations of Enantiomerically Pure C4-Symmetric Tetraalkoxyresorcin[4]arenes Obtained from Camphorsulfonate Derivatives

    42116.pdf (683.7Kb)
    Access Status
    Open access
    Authors
    Buckley, B.
    Page, P.
    Chan, Y.
    Heaney, H.
    Klaes, M.
    Mcildowie, M.
    McKee, V.
    Mattay, J.
    Mocerino, Mauro
    Moreno, E.
    Skelton, B.
    White, A.
    Date
    2006
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Buckley, Benjamin and Page, Philip and Chan, Yohan and Heaney, Harry and Klaes, Michael and Mcildowie, Matthew and McKee, Vickie and Mattay, Jochen and Mocerino, Mauro and Moreno, Eduardo and Skelton, Brian and White, Allan. 2006. The Preparation and Absolute Configurations of Enantiomerically Pure C4-Symmetric Tetraalkoxyresorcin[4]arenes Obtained from Camphorsulfonate Derivatives. European Journal of Organic Chemistry. (22): pp. 5135-5151.
    Source Title
    European Journal of Organic Chemistry
    DOI
    10.1002/ejoc.200600591
    School
    Applied Organic Geochemistry
    Remarks

    2006 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

    URI
    http://hdl.handle.net/20.500.11937/42136
    Collection
    • Curtin Research Publications
    Abstract

    The preparation of a series of diastereoisomeric tetracamphorsulfonates derived from racemic tetramethoxyresorcin[4]arenes was achieved by reactions with an excess of (S)‐(+)‐10‐camphorsulfonyl chloride in pyridine followed by isolation using flash chromatography. Tetradeprotonation of a number of tetramethoxyresorcin[4]arenes using n‐butyllithium in tetrahydrofuran, followed by reactions using (S)‐(+)‐10‐camphorsulfonyl chloride, gave the same tetracamphorsulfonates. Mono‐, di‐ and tricamphorsulfonates were also prepared following selective deprotonation. In the reactions with tetraisopropyloxy‐ and tetracyclopentyloxyresorcin[4]arenes, only the mono‐ and dicamphorsulfonates were formed. X‐ray crystallographic analysis established the absolute configurations of three diastereoisomerically pure tetracamphorsulfonates, including a diastereoisomer prepared from 6,12,18,24‐tetramethoxy‐2,8,14,20‐tetrakis(2‐methylpropyl)resorcin[4]arene. An additional pair of diastereoisomers was also prepared using (R)‐(–)‐10‐camphorsulfonyl chloride and 6,12,18,24‐tetramethoxy‐2,8,14,20‐tetrakis(2‐methylpropyl)resorcin[4]arene, for one of which the structure was confirmed by an additional X‐ray structure determination. Hydrolytic removal of the camphorsulfonyl residue(s) from the various diastereoisomers gave enantiomers of known absolute configurations. In some cases, the chiral nonracemic tetraalkoxyresorcin[4]arenes were converted into known tetrabenzoxazine derivatives by using N,N‐bis(methoxymethyl)[(S)‐(–)‐(α‐methylbenzyl)]amine in thermal or microwave‐assisted reactions.

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    • The Preparation and Absolute Configurations of Enantiomerically Pure C4-Symmetric Tetraalkoxyresorcin[4]arenes Obtained from Camphorsulfonate Derivatives
      Buckley, B.; Page, P.; Chan, Y.; Heaney, H.; Klaes, M.; Mcildowie, Matthew; McKee, V.; Mattay, J.; Mocerino, Mauro; Moreno, E.; Skelton, B.; White, A. (2006)
      The preparation of a series of diastereoisomeric tetracamphorsulfonates derived from racemic tetramethoxyresorcin[4]arenes was achieved by reactions with an excess of (S)-(+)-10-camphorsulfonyl chloride in pyridine followed ...
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      Buckley, B.; Boxhall, J.; Page, P.; Chan, Y.; Elsegood, M.; Heaney, H.; Holmes, K.; Mcildowie, M.; McKee, V.; McGarth, M.; Mocerino, Mauro; Poulton, A.; Sampler, E.; Skelton, B.; White, A. (2006)
      The measurement of the pKa of racemic tetramethoxyresorcin[4]arenes explains the failure to obtain good yields in attempted Mannich reactions of these substrates under classical reaction conditions. The failure is related ...
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      Buckley, B.; Boxhall, J.; Page, P.; Chan, Y.; Elsegood, M.; Heaney, H.; Holmes, K.; Mcildowie, Matthew; McKee, V.; McGrath, M.; Mocerino, Mauro; Poulton, A.; Sampler, E.; Skelton, B.; White, A. (2006)
      The measurement of the pKa of racemic tetramethoxyresorcin[4]arenes explains the failure to obtain good yields in attempted Mannich reactions of these substrates under classical reaction conditions. The failure is related ...
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