Five phosphonic acid analogues of N-acetylneuraminic acid (Neu5Ac) and 3-deoxy-d-glycero-d-galacto-2-nonulosonic acid (KDN) have been synthesized. The synthesis was accomplished using an indium-mediated coupling of N-acetylmannosamine or mannose with dimethyl (3-bromopropen-2-yl)phosphonate in aqueous media. The potential of these phosphonate acid analogues of sialic acids as sialidase inhibitors was evaluated and found to show moderate biological acitivities.

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We have stereoselectively synthesized the analogues of the methyl β‐glycosides of (1→6)‐β‐D‐galacto‐oligosaccharides (up to tetrasaccharide), in which the interglycosidic oxygen atoms are replaced by a methylene group.