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Issue 38, 2018
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Synthesis of macrocyclic precursors of the vioprolides

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The vioprolides are novel depsipeptides that have not been synthesized. However, they have been identified as important targets for synthesis because of their novel biological activities and challenging chemical structures. Following early work on the synthesis of a modified tetrapeptide that contained both the (E)-dehydrobutyrine and thiazoline components of vioprolide D, problems were encountered in taking an (E)-dehydrobutyrine containing intermediate further into the synthesis. A second approach to vioprolides and analogues was therefore investigated in which (E)- and (Z)-dehydrobutyrines were to be introduced by selenoxide elimination very late in the synthesis. A convergent approach to advanced macrocyclic precursors of the vioprolides was then completed using a modified hexapeptide and a dipeptidyl glycerate. In this work, it was necessary to protect the 2-hydroxyl group of the glycerate as its acetate and not as its 2,2,2-trichloroethoxycarbonate. Preliminary studies were carried out on the introduction of the required dehydrobutyrine and thiazoline components into advanced intermediates.

Graphical abstract: Synthesis of macrocyclic precursors of the vioprolides

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The article was received on 21 Jul 2018, accepted on 30 Aug 2018 and first published on 31 Aug 2018

Article type: Paper
DOI: 10.1039/C8OB01756E
Org. Biomol. Chem., 2018,16, 6935-6960

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    Synthesis of macrocyclic precursors of the vioprolides

    E. Butler, L. Florentino, D. Cornut, G. Gomez-Campillos, H. Liu, A. C. Regan and E. J. Thomas, Org. Biomol. Chem., 2018, 16, 6935
    DOI: 10.1039/C8OB01756E

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