Scheme 3.
Microwave synthesis of trivalent sialic acid (20, 82%) and disialic acid (Sia(α-2→8)Sia, 21, 88%) glycoclusters. (a) 0.1 M NH4OAc, pH 4.5, 0.1 M aniline, 25% of 400 W, 30–90 min.
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