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An efficient synthesis of gamma-lactone-type sialic acid, which is an isomer of 2,3-dehydrosialic acid, was achieved from the corresponding sialic ester. The sialic ester was reconstructed from the gamma-lactone in a 95% yield. The gamma-lactone structure was determined by methylating to its corresponding methyl ether.

Synthesis of γ-Lactone-Type Sialic Acid, an Isomer of 2,3-Dehydrosialic Acid