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General Procedure for Oligosaccharide Assembly.
To a solution of 1 (100.0 mg, 0.155 mmol), and BSM (49.1 mg, 0.233 mmol) in CH2Cl2 (4 mL) was added 4 Å MS (40 mg), and the mixture was cooled down to -70 °C, and then Tf2O (26.2 mg, 0.093 mmol) was added, after 5 min, 1 was consumed completely. After addition of the acceptor 2 (66.7 mg, 0.140 mmol) to the preactivated donor, the mixture was stirred for 15 min. Then the reaction mixture was warmed up to r.t. for 15 min. The mixture was cooled down to -70 °C again, Tf2O (43.7 mg, 0.155 mmol) was added, after 5 min, and the new formed disaccharide was consumed completely. After addition of the acceptor 11 (71.9 mg, 0.155 mmol) to the preactivated donor, the mixture was stirred for 15 min. Then the reaction mixture was warmed up to r.t. for 15 min. The course of the reaction was monitored by TLC. Then, Et3N (0.5 mL) was then added to the mixture. The precipitate was filtered off and the filtrate was concentrated. The residue was purified by column chromatography on silica gel to give 12 (126.9 mg, 52%). 1H NMR (500 MHz, CDCl3): δ = 2.97 (s, 1 H), 3.16 (dd, 1 H, J = 6.0, 9.0 Hz), 3.22-3.28 (m, 2 H), 3.39 (t, 1 H, J = 7.5 Hz), 3.46-3.48 (m, 5 H), 3.60-3.68 (m, 4 H), 3.73 (d, 1 H, J = 11.0 Hz), 3.79 (dd, 1 H, J = 3.5, 10.0 Hz), 3.84 (t, 1 H, J = 6.5 Hz), 3.88-3.91 (m, 1 H), 3.94-3.97 (m, 1 H), 4.11-4.26 (m, 6 H), 4.35 (t, 2 H, J = 12.0 Hz), 4.42-4.53 (m, 4 H), 4.58-4.63 (m, 2 H), 4.69 (d, 1 H, J = 6.0 Hz), 4.77-4.86 (m, 4 H), 5.04 (d, 1 H, J = 3.5 Hz, H-1′′), 5.10 (d, 1 H, J = 11.0 Hz), 5.32 (s, 1 H), 5.61 (dd, 1 H, J = 8.5, 10.0 Hz), 7.06-7.38 (m, 40 H), 7.48-7.50 (m, 3 H), 7.97-7.99 (m, 2 H). 13C NMR (125 MHz, CDCl3): δ = 56.95, 66.60, 68.36, 68.73, 68.80, 69.84, 71.37, 72.13, 72.26, 73.09, 73.14, 73.22, 74.41, 74.64, 74.68, 74.92, 75.26, 75.48, 75.84, 77.64, 78.58, 81.96, 83.03, 95.55, 100.95, 101.20, 104.48, 126.39, 127.09, 127.29, 127.37, 127.45, 127.49, 127.58, 127.65, 127.81, 127.91, 127.99, 128.09, 128.15, 128.23, 128.34, 128.41, 128.70, 129.76, 129.85, 133.01, 137.77, 138.16, 138.46, 138.60, 138.65, 138.78, 139.07, 164.69. HRMS (ESI): m/z calcd for C82H88NO17 [M + NH4]+: 1358.6047; found: 1358.6053.
22
Preparation of Trisaccharide 13.
To a solution of compound 12 (80.0 mg, 0.060 mmol) in MeOH (10 mL) was added MeONa/MeOH (30 wt%, 0.4 mL), and the reaction mixture was stirred for 8 h at r.t. The mixture was neutralized (H+ resin, weak acid), filtered and concentrated. The resulting residue was dissolved in THF-AcOH-H2O (2:2:1, 10 mL) and then Pd/C (10.0 mg) was added. The reaction mixture was stirred under 1 atm of H2 for 24 h. The Pd/C was filtered off and the filtrate was concentrated. The product was purified by C-18 reverse-phase column chromatography to give 13 (28.0 mg, 90%). 1H NMR (500 MHz, D2O): δ = 3.29-3.30 (m, 1 H), 3.58 (s, 3 H), 3.61-3.63 (m, 1 H), 3.65-3.68 (m, 3 H), 3.71-3.87 (m, 8 H), 3.94-4.02 (m, 3 H), 4.18-4.21 (m, 2 H), 4.41 (d, 1 H, J = 8.0 Hz, H-1), 4.52 (d, 1 H, J = 7.5 Hz, H-1′), 5.14 (d, 1 H, J = 4.0 Hz, H-1′′). 13C NMR (125 MHz, D2O): δ = 57.98, 60.88, 61.68, 61.74, 65.56, 68.95, 69.89, 70.03, 70.33, 71.59, 73.52, 75.21, 75.49, 75.80, 77.96, 79.38, 96.19, 103.60, 103.83. HRMS (ESI): m/z calcd for C19H34O16Na [M + Na]+: 541.1739; found: 541.1748.
23
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Data for Compound 16.
1H NMR (500 MHz, CDCl3): δ = 1.28 (s, 3 H), 1.31 (s, 3 H), 1.43 (s, 3 H), 1.47 (s, 3 H), 3.20-3.24 (m, 2 H), 3.32-3.40 (m, 3 H), 3.47-3.53 (m, 3 H), 3.64 (dd, 1 H, J = 7.5, 10.0 Hz), 3.69 (dd, 1 H, J = 3.0, 10.0 Hz), 3.82-3.89 (m, 2 H), 3.95-4.04 (m, 5 H), 4.12 (d, 1 H, J = 7.5 Hz), 4.18 (d, 1 H, J = 9.0 Hz), 4.22-4.30 (m, 5 H), 4.33 (d, 1 H, J = 10.5 Hz, H-1′), 4.36 (d, 1 H, J = 11.5 Hz), 4.42-4.58 (m, 7 H), 4.62 (d, 1 H, J = 11.0 Hz, H-1′′), 4.67 (t, J = 11.5 Hz, 2 H), 4.78 (d, 1 H, J = 11.0 Hz), 4.86 (d, 1 H, J = 11.5 Hz), 5.00 (d, 1 H, J = 11.0 Hz), 5.09 (d, 1 H, J = 4.0 Hz, H-1′′′), 5.39 (s, 1 H), 5.53 (d, 1 H, J = 5.0 Hz, H-1), 5.73 (dd, 1 H, J = 8.5, 10.0 Hz), 7.09-7.31 (m, 38 H, ArH), 7.36-7.41 (m, 3 H), 7.52 (d, 2 H, J = 8.0 Hz), 7.97 (d, 2 H, J = 8.0 Hz). 13C NMR (125 MHz, CDCl3): δ = 24.47, 25.02, 26.01, 26.03, 66.40, 66.68, 67.29, 68.80, 69.04, 69.69, 69.84, 70.07, 70.48, 70.74, 71.35, 72.08, 72.19, 73.16, 73.26, 74.26, 74.61, 74.69, 74.94, 75.02, 75.31, 75.86, 78.56, 81.40, 84.38, 95.23, 96.33, 100.99 (2 C), 104.30, 108.51, 109.28, 126.39, 127.18, 127.26, 127.33, 127.36, 127.42, 127.47, 127.55, 127.71, 127.80, 127.98, 128.07, 128.10, 128.13, 128.19, 128.21, 128.26, 128.29, 128.61, 128.81, 129.86, 129.99, 132.72, 137.65, 138.23, 138.60, 138.68, 138.77, 138.81, 164.74. HRMS (ESI): m/z calcd for C93H104NO22 [M + NH4]+: 1586.7045; found: 1586.7039.