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Synthesis of an alpha-(2,3)-Sialylated, Complex-Type Undecasaccharide.
1RIKEN (The Institute of Physical and Chemical Research) and CREST Japan Science and Technology Corporation (JST) Hirosawa 2 - 1, Wako-Shi, Saitama, 351-0198 (Japan).
Angewandte Chemie (International Ed. in English)
|February 12, 2000
Summary
Synthesizing complex undecasaccharide 1, a component of human glycoproteins, was achieved efficiently using two building blocks and stereo-controlled glycosylation reactions. This method provides key beta-mannoside linkages crucial for biological function.
Area of Science:
- Carbohydrate Chemistry
- Glycobiology
- Organic Synthesis
Background:
- Undecasaccharides are complex carbohydrates with significant biological roles.
- Specific linkages, such as beta-mannosides, are critical for the function of glycoproteins.
- Human glycoproteins like follitropin and gonadotropin contain important undecasaccharide structures.
Purpose of the Study:
- To develop an efficient synthetic route to a complex undecasaccharide (1).
- To establish stereocontrolled methods for forming critical glycosidic linkages.
- To enable access to undecasaccharide structures found in vital human glycoproteins.
Main Methods:
- Utilized two key building blocks for the synthesis.
- Employed two stereo- and regioselective glycosylation reactions.
- Implemented p-methoxybenzyl-assisted beta-mannosylation for stereocontrol.
Main Results:
- Achieved efficient synthesis of the target undecasaccharide (1).
- Successfully formed the critical beta-mannoside linkage with high stereocontrol.
- Demonstrated the feasibility of using minimal building blocks for complex carbohydrate synthesis.
Conclusions:
- The developed synthetic strategy provides efficient access to complex undecasaccharides.
- Stereocontrolled beta-mannosylation is a key reaction for constructing biologically relevant glycan structures.
- This work facilitates further studies on the function of undecasaccharides in human glycoproteins.