Scheme 3.
Synthesis of compounds 2f and 2h. Reagents and conditions: (a) i—KOH, EtOH, dioxane, ii—NaOH, 30% H2O2, EtOH; (b) acetobromo-α-d-galactose, K2CO3, DMF; (c) 10% Pd/C, H2; (d) i—MeONa, MeOH, ii—H+ resin.
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