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Isothiourea-mediated organocatalytic Michael addition-lactonization on a surface: modification of SAMs on silicon oxide substrates

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Author(s)

Ross Chisholm, John David Parkin, Andrew David Smith, Georg Hähner

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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.
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Details

Original languageEnglish
Pages (from-to)3130–3138
JournalLangmuir
Volume32
Issue number13
Early online date25 Mar 2016
DOIs
Publication statusPublished - 5 Apr 2016

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