Journal
CARBOHYDRATE RESEARCH
Volume 371, Issue -, Pages 32-39Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carres.2013.01.003
Keywords
Fondaparinux; Modular synthesis; L-Idopyranosyl donor
Funding
- Committee of Science and Technology of Shanghai [10QB1403900]
- National Natural Science Foundation of China [20902059]
- National Science Grand Projects of New Drug RD [2011ZX09202-101-01]
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The anti-thromboembolic pentasaccharide Fondaparinux was synthesized in 36 steps for the longest linear route, with 0.017% overall yield from D-glucose. Only three kinds of protecting groups were used for hydroxyl protection, Bn, Ac, and Bz, to accomplish this complex synthesis without decreasing the synthetic efficiency. Three L-idopyranosyl donors were investigated. Thioethyl glycoside is an efficient donor for L-idopyranosyl glycosylation with full alpha-selectivity, while L-idopyranosyl trichloroacetimidate resulted in poor alpha/beta selectivity. A practical synthesis of key intermediate 1,6-anhydro-L-idopyranose 17 by H+/beta-CD catalyst was developed. (C) 2013 Elsevier Ltd. All rights reserved.
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