Scheme 4. Studies on Regioselective Glycosylationa.
aReagents and conditions: (a) TMSOTf, CH2Cl2, 0 °C, 54% for 15; 65% for 18; 48% for 21; 83% for 23; 51% for 26. (b) Ac2O, Pyr. (c) ClAcCl, Pyr.
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