Scheme 1.
Synthesis of compounds 2a–2e. Reagents and conditions: (a) Ph2CCl2, 180 °C, 5 min; (b) O-acetylglycosyl bromide, K2CO3, DMF; (c) 10% Pd/C, H2; (d) i—MeONa, MeOH, ii—H+ resin.
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