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Synthesis of di-O- and tri-O-galloyl-d-glucosides 1 and 2, from 15.
Reagents and conditions: (a) 2 N HCl, 80 °C, 16 h; (b) BnG-Cl, 3 g of 18 in 30 mL anhydrous pyridine, 80 °C, 18 h; (c) BnG-Cl, 4.5 g of 18 in 170 mL anhydrous pyridine, 80 °C, 18 h; (d) H2, 10% Pa-C, in THF containing approximate 25% of aqueous 95% EtOH, 40 °C, 10 atm, 12 h.
