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Synthesis of ethyl 2,3-di-O-galloyl-α-d-glucopyranoside (11) and ethyl 2,3-di-O-galloyl-β-d-glucopyranoside (12) from 17.
Reagents and conditions: (a) BnG-Cl, in anhydrous pyridine, 60 °C, 48 h; (b) H2, 10% Pa-C, in THFcontaining 6.7% of aqueous 95% EtOH, 40 °C, 10 atm, 12 h.
