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Synthesis of a biotinylated penta-α-(1→6)-D-glucoside based on the rational design of an α-stereoselective glucosyl donor

Abstract

Two glucosyl donors, which allowed for α-selective glucosylation of primary hydroxyl groups, were designed using a combination of acyl groups capable of remote participation, an electron withdrawing pentafluorobenzoyl substituent and a bulky TBDPS protection. The first had a participating levulinoyl group at O-3 and the TBDPS protection at O-6, and the second bore an acetyl group at O-3 and the pentafluorobenzoyl one at O-6. With the help of these donors, two synthetic schemes, convergent and linear, towards a pentaglucoside representing α-(1→6)-linked glucan of Helicobacter pylori were evaluated. The linear scheme proved to be preferential over the convergent one because of insufficiently high α-stereoselectivity demonstrated by disaccharide donors. For the linear scheme, the pentafluorobenzoyl group turned out more convenient than TBDPS at the removal step. The α-(1→6)-linked pentaglucoside was prepared by iteration of glucosylation with the donor bearing 3-O-acetyl and 6-O-pentafluorobenzoyl and subsequent liberation of the 6-OH group. Biotin was attached to the pentaglucoside via the spacer amino group.

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Publication details

The article was received on 08 Nov 2017, accepted on 02 Dec 2017 and first published on 04 Dec 2017


Article type: Research Article
DOI: 10.1039/C7QO01007A
Citation: Org. Chem. Front., 2017, Accepted Manuscript
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    Synthesis of a biotinylated penta-α-(1→6)-D-glucoside based on the rational design of an α-stereoselective glucosyl donor

    B. S. Komarova, V. S. Dorokhova, Y. E. Tsvetkov and N. E. Nifantiev, Org. Chem. Front., 2017, Accepted Manuscript , DOI: 10.1039/C7QO01007A

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