Scheme 1.
Preparation of tri-O-benzylgalloyl chloride (13).
Reagents and conditions: (a) K2CO3, PhCH2Cl, DMSO, 140 °C, 8 h; (b) NaOH, H2O/MeOH, 90 °C, 5 h; (c) SOCl2, 90 °C, 9 h.
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