Scheme 3.
Synthesis of sugar derivatives 21–30. Reagents and Conditions: (i) propargyl alcohol, BF3⋅Et2O, DCM, r.t., 1 h; (ii) 2-bromoethanol, BF3⋅Et2O, DCM, r.t., 2 h; (iii) NaN3, DMF, r.t. 24 h; (iv) 1. MeONa, MeOH, r.t. 20 min; 2. Amberlyst-15.
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