New sugar donors using the same synthesis of sugar chain

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PROBLEM TO BE SOLVED : To provide techniques for efficient chemical synthesis of sugar chains.SOLUTION : There are provided sugar derivatives represented by the formula (Ia) in the figure and methods of synthesizing sugar chains using the same. [In the formula, Rrepresents a pivaloyl group; Rtogether represent a benzylidene group; Reach represent a hydrogen atom or a tert-butyldiphenylsilyl or acetyl group protected hydroxy group, where one of Rrepresents a hydrogen atom and the other represents a tert-butyldiphenylsilyl or acetyl group protected hydroxy group; Ris a protected or unprotected hydroxy group; Rare identical or different and each represent a protected or unprotected hydroxy group or a protected or unprotected amino group; Rare identical or different and each represent a hydrogen atom or a hydroxy group protecting group; and n represents an integer between 1 and 3.]