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Abstract
The phosphitylation of 2-α-O-Benzyl-N-acetylneuraminic acid (2) and of the methyl 2-α-O-methyl-N-acetylneuraminate (3) with 2-chloro-4H-1,2,3-benzodioxaphosphorin-4-one (4) is described. The reaction affords a ready access to 9-phosphorylated derivatives of N-acetylneuraminic acid (1).