Isothiourea-mediated organocatalytic Michael addition-lactonization on a surface : modification of SAMs on silicon oxide substrates
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Date
05/04/2016Grant ID
ep/k000411/1
ep/l017008/1
EP/K031252/1
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Abstract
Tailoring the functionality of self-assembled monolayers (SAMs) can be achieved either by depositing prefunctionalized molecules with the appropriate terminal groups or by chemical modification of an existing SAM in situ. The latter approach is particularly advantageous to allow for diversity of surface functionalization from a single SAM and if the incorporation of bulky groups is desired. In the present study an organocatalytic isothiourea-mediated Michael addition–lactonization process analogous to a previously reported study in solution is presented. An achiral isothiourea, 3,4-dihydro-2H-pyrimido[2,1-b]benzothiazole (DHPB), promotes the intermolecular Michael addition–lactonization of a trifluoromethylenone terminated SAM and a variety of arylacetic acids affording C(6)-trifluoromethyldihydropyranones tethered to the surface. X-ray photoelectron spectroscopy, atomic force microscopy, contact angle, and ellipsometry analysis were conducted to confirm the presence of the substituted dihydropyranone. A model study of this approach was also performed in solution to probe the reaction diastereoselectivity as it cannot be measured directly on the surface.
Citation
Chisholm , R , Parkin , J D , Smith , A D & Hähner , G 2016 , ' Isothiourea-mediated organocatalytic Michael addition-lactonization on a surface : modification of SAMs on silicon oxide substrates ' , Langmuir , vol. 32 , no. 13 , pp. 3130–3138 . https://doi.org/10.1021/acs.langmuir.5b04686
Publication
Langmuir
Status
Peer reviewed
ISSN
0743-7463Type
Journal article
Rights
(c) 2016 American Chemical Society. This is an open access article published under a Creative Commons Attribution (CC-BY) License, which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.
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Financial support from the EPSRC (EP/K000411/1 and EP/L017008/1) is gratefully acknowledged.Collections
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