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Typical Glycosylation Procedure Triflic anhydride (11.0 mL, 0.061 mmol) was added to a stirred solution of p-methylphenyl 3,4,6-tri-O-acetyl-2- deoxy-1-thio-a-D-galactopyranoside (1a, 30.0 mg, 0.076 mmol), benzenesulfinyl morpholine (BSM, 12.9 mg, 0.061 mmol), and 4 MS (350 mg, activated powder) in CH2Cl2 (3.0 mL) at 72 C under nitrogen atmosphere. The reaction mixture was stirred for 10 min. After loss of 1a detected by TLC, a solution of methyl 3-O-benzyl-4,6-O-benzylidene-a- D-glucopyranoside (2a, 18.8 mg, 0.051 mmol) in CH2Cl2 (0.5 mL) was added dropwise to the reaction mixture. The mixture was stirred for 30 min, and the reaction was quenched by Et3N (8.0 mL). The precipitate was filtered off, and the filtrate was concentrated. The residue was purified by column chromatography on silica gel (PEEtOAc, 2.5:1) to give methyl 3-O-benzyl-4,6-O-benzylidene-2-O-(3,4,6- tri-O-acetyl-2-deoxy-a-D- galactopyranosyl)-a-D-glucopyranoside (3a, 27.6 mg, 84% yield) as a foam. Rf = 0.35 (PEEtOAc, 1.5:1). 1H NMR (500 MHz, CDCl3): d = 7.50 (dd, 2 H, J = 2.0, 7.5 Hz), 7.407.33 (m, 7 H), 7.297.27 (m, 1 H), 5.60 (s, 1 H), 5.37 (ddd, 1 H, J = 3.0, 5.0, 12.5 Hz), 5.15 (d, 1 H, J = 3.0 Hz), 5.14 (d, 1 H, J = 3.5 Hz), 4.93 (d, 1 H, J = 10.5 Hz), 4.89 (d, 1 H, J = 3.5 Hz), 4.71 (d, 1 H, J = 10.5 Hz), 4.36 (t, 1 H, J = 6.5 Hz), 4.31 (dd, 1 H, J = 4.5, 10.0 Hz), 3.98 (t, 1 H, J = 9.5 Hz), 3.90 (dd, 1 H, J = 6.5, 11.0 Hz), 3.873.74 (m, 4 H), 3.65 (t, 1 H, J = 9.5 Hz), 3.43 (s, 3 H), 2.132.08 (m, 4 H), 2.00 (s, 3 H), 1.961.92 (m, 4 H). 13C NMR (125 MHz, CDCl3): d = 170.13, 170.23, 169.79, 138.06, 137.26, 128.96, 128.54, 128.47, 128.25, 127.86, 125.95, 101.27, 97.12, 94.10, 82.71, 76.85, 75.74, 73.45, 69.00, 66.61, 65.87, 62.25, 61.87, 55.23, 29.86, 20.81, 20.70. MS (ESI-TOF, positive): m/z = 667 [M + Na]+. Anal. Calcd for C33H40O13: C, 61.48; H, 6.25. Found: C, 61.65; H, 6.40.
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