Scheme 4.
Synthesis of glycoconjugates 43–58 (A), 59–66 (B), 67–69 (C), and 70–72 (D). Reagents and Conditions: (i) CuSO4·5H2O, NaAsc, i-PrOH, THF, H2O, r.t., 24 h.
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