Scheme 6.
Synthesis of glycoconjugates type I and II according to Strategy I. Reagents and Conditions: (i) CuSO4·5H2O, NaAsc, i-PrOH/H2O (1:1, v/v), r.t., 24 h; (ii) 1. NaOMe, MeOH, r.t., 0.5 h; 2. Amberlyst-15.
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