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Reagents and conditions: (a) 10% Pd/C cartridge (s-cart, 30 × 4 mm i.d.), 1 bar (full H2 mode), 25 °C, 1 mL min–1; (b) LiAlH4, THF, 0 °C → rt; (c) SnCl2, HCl 12 M, Et2O, (CH2O)n, 70 °C; (d) CH2N2, Et2O, 0 °C → rt; (e) methyl-1-bromo-2,3,4-tri-O-acetyl-α-d-glucuronate (13), Fetizon reagent, molecular sieves, toluene; (f) Na2CO3, MeOH, rt.
