Total Synthesis of Natural Disaccharide Sambubiose
A practical and robust synthetic method to obtain the natural disaccharide sambubiose (2-<i>O</i>-β-D-xylopyranosyl-D-glucopyranose) is reported, exploring the key step in the synthesis, i.e., stereoselective <i>O</i>-glycosylation. Specifically, the best combinations of glyc...
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| Main Authors: | , , , |
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| Format: | Book |
| Published: |
MDPI AG,
2020-08-01T00:00:00Z.
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| Online Access: | Connect to this object online. |
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| Summary: | A practical and robust synthetic method to obtain the natural disaccharide sambubiose (2-<i>O</i>-β-D-xylopyranosyl-D-glucopyranose) is reported, exploring the key step in the synthesis, i.e., stereoselective <i>O</i>-glycosylation. Specifically, the best combinations of glycoside donors and acceptors were identified, stereospecific control of the reaction was achieved by screening several catalysts and protection/deprotection steps were evaluated and improved. The best result was obtained by coupling allyl 3,5,6-tri-<i>O</i>-benzyl-β-D-glucofuranoside with 2,3,4-tri-<i>O</i>-acetyl-D-xylopiranosyl-α-trichloro acetimidate in the presence of trimethylsilyl triflate as a catalyst giving the corresponding protected target compound as a correct single isomer. The latter was transformed accordingly into the desired final product by deprotection steps (deallylation, deacetylation, and debenzylation). Sambubiose was synthesized into a satisfactory and higher overall yield than previously reported and was also characterized. |
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| Item Description: | 10.3390/ph13080198 1424-8247 |