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Issue 32, 2013
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Systematic study on free radical hydrothiolation of unsaturated monosaccharide derivatives with exo- and endocyclic double bonds

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Abstract

Exo- and endocyclic double bonds of glycals and terminal double bonds of enoses were reacted with various thiols by irradiation with UV light in the presence of a cleavable photoinitiator. The photoinduced radical-mediated hydrothiolation reactions showed highly varying overall conversions depending not only on the substitution pattern and electron-density of the double bond but also on the nature and substitution pattern of the thiol partner. Out of the applied thiols thiophenol, producing the highly stabilized thiyl radical, exhibited the lowest reactivity toward each type of alkene. In most cases, the hydrothiolations took place with full regio- and stereoselectivities. Successful addition of 1,2 : 3,4-di-O-isopropylidene-6-thio-α-D-galactopyranose to a 2,3-unsaturated N-acetylneuraminic acid derivative, providing a (3 → 6)-S-linked pseudodisaccharide, demonstrated that the endocyclic double bond of Neu5Ac-2-ene, bearing an electron-withdrawing substituent, shows sufficient reactivity in the photoinduced thiol–ene coupling reaction.

Graphical abstract: Systematic study on free radical hydrothiolation of unsaturated monosaccharide derivatives with exo- and endocyclic double bonds

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Publication details

The article was received on 19 Mar 2013, accepted on 25 Jun 2013 and first published on 11 Jul 2013


Article type: Paper
DOI: 10.1039/C3OB40547H
Citation: Org. Biomol. Chem., 2013,11, 5339-5350
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    Systematic study on free radical hydrothiolation of unsaturated monosaccharide derivatives with exo- and endocyclic double bonds

    L. Lázár, M. Csávás, Á. Hadházi, M. Herczeg, M. Tóth, László Somsák, T. Barna, P. Herczegh and A. Borbás, Org. Biomol. Chem., 2013, 11, 5339
    DOI: 10.1039/C3OB40547H

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