Water → (2R,3S,4S,5R,6S)-3,4,5-tris(Benzyloxy)-2-((benzyloxy)methyl)-6-(p-tolylthio)tetrahydro-2H-pyran

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Reaction Conditions

Reaction Steps

p-Methylphenyl 1-thio-β-D-galactopyranoside (1.0 g, 3.5 mmol) was dissolved in dry DMF (15 mL) and cooled to −10° C. At this temperature (840 mg, 35 mmol) NaH was added and the mixture allowed to warm up to rt. and stirred for an additional 10 min. Then BnBr (4.1 mL, 35 mmol) was added, and the mixture was stirred for 5 h. At 0° C. 10 mL H2O was added and the mixture extracted with EtOAc (3×50 mL). The organic layer was dried over MgSO4 and evaporated to dryness. Flash chromatography using Hexane/EtOAc (5:1) gave the title compound as a white solid (2.01 g, 89%). [α]D22 −1.2° (c, 0.5, CHCl3); 1H-NMR (400 MHz, CDCl3), δ 2.27 (s, 3H), 3.56–3.65 (m, 4H), 3.89 (t, 1H, J=9.4 Hz) 3.97 (s, 1H), 4.42 (ABq, 2H, J=11.6 Hz), 4.594.60 (m, 3H), 4.70 (m, 3H), 4.73 (ABq, 2H, J=10.1 Hz), 4.95 (d, 1H, J=11.5 Hz), 6.98 (d, 2H, J=8.6 Hz), 7.25–7.47 (m, 22H); 13C-NMR (400 MHz, CDCl3), δ 21.04, 68.68, 72.63, 73.48, 74.34, 75.54, 77.16, 77.24, 84.13, 87.95, 127.36, 127.49, 127.60, 127.65, 127.71, 127.78, 127.86, 128.09, 128.26, 128.35, 129.49, 132.10; HRMS (M+Cs) calcd for C41H42O5SCs 779.1807. found 779.1782.

Provenance & Evidence