Synthesis of the lipoteichoic acid of the streptococcus species DSM 8747
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The lipoteichoic acid (LTA) of the Streptococcus species DSM 8747 consists of a Beta-D-galactofuranosyl diacylglycerol moiety (with different acyl groups) that is linked via 6-0 to a poly(glycerophosphate) backbone; about 30% of the glycerophosphate moieties carry at 2-0 hydrolytically labile o-alanyl residues. As typical LTA for this array of compounds LTA la was synthesized. To this end, from o-galactose the required galactofuranosyl building block 5 was obtained. The anomeric stereocontrol in the glycosylation step with 1,2-0-cyclohexylidene-sn-glycerol (4) was based on anchimeric assistance, thus finally leading to the unprotected core glycolipid 16. Regioselective protection and de protection procedures permitted the defined attachment of the pentameric glycerophosphate 3 to the 6-hydroxy group of the galactose residue. Introduction of four D-alanyl residues led after global deprotection and purification to target molecule la possessing on average about two D-alanyl residues at 2-0 of the pentameric glycerophosphate backbone, thus being in close accordance with the structure of the natural material.
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QIAO, Yan, Buko LINDNER, Ulrich ZĂ„HRINGER, Peter TRUOG, Richard R. SCHMIDT, 2010. Synthesis of the lipoteichoic acid of the streptococcus species DSM 8747. In: Bioorganic & medicinal chemistry. 2010, 18(11), pp. 3696-3702. ISSN 0968-0896. eISSN 1464-3391. Available under: doi: 10.1016/j.bmc.2010.04.006BibTex
@article{Qiao2010Synth-375, year={2010}, doi={10.1016/j.bmc.2010.04.006}, title={Synthesis of the lipoteichoic acid of the streptococcus species DSM 8747}, number={11}, volume={18}, issn={0968-0896}, journal={Bioorganic & medicinal chemistry}, pages={3696--3702}, author={Qiao, Yan and Lindner, Buko and Zähringer, Ulrich and Truog, Peter and Schmidt, Richard R.} }
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