Abstract
A new method for cleaving methyl ethers off protected saccharides using Co2(CO)8/Et3SiH/CO system was developed. The method showed regioselectivity in different protected monosaccharides with various anomeric groups. The primary and equatorial secondary methyl ethers were preferentially removed. This method was successfully applied to the synthesis of the DEF trisaccharide segment of Idraparinux, which is highly methylated.
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