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49649083167
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4-Di-0-benzoyl-1,2-0-benzylidene-a-L- fucopyranose (6) To a stirred solution of fucosyl bromide 5 (16.9 g, 31.3 mmol, 1.00 equiv) in abs. MeCN (106 mL) was added dry KI (7.46 g, 44.9 mmol, 1.43 equiv) and NaBH4 (1.13 g, 29.9 mmol, 0.96 equiv, The mixture was stirred for 2.5 h. Then more NaBH4 (1.13g, 29.9 mmol, 0.96 equiv) was added. After a total reaction time of 5 h, the solvent was removed. The residue was dissolved in EtOAc, washed with ice water, cold sat. NaHCO3 solution, and twice with brine. The mixture was dried (Na 2SO4, concentrated, and the residue purified by column chromatography (SiO2; pentane-EtOAc, 5:1) to afford 10.2 g (71, of 6 as a colorless foam. Analytical Data of the exo-Product IR (KBr, 2985,1727,1602,1452,1280cm-1. 1HNMR(SOO MHz, CDCl3, δ, 1.31 (d, J= 6.2 Hz, 3 H, 4.51 dd
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7Na: 483.14142; found: 483.14160.
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38
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49649112756
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4-Di-O-benzoyl-2-0-benzyl-α/ β-L-fucopyranose (7) To a stirred solution of benzylidene fucose 6(161 mg, 0.35 mmol, 1.0 equiv) in abs. THF (2 mL) BH3-THF (0.53 mL, 0.53 mmol, 1.5 equiv) was added at r.t, then Bu2BOTf (52 μL, 0.053 mmol, 0.15 equiv, The mixture was stirred for 1-2 h. Water was added and the reaction mixture was extracted with EtOAc. The organic phase was dried (Na 2SO4, concentrated, and the residue purified by column chromatography (SiO2; pentane-EtOAc, 3:1 to 2:1, to afford 72 mg (45, of 7 and 70 mg (43, of 8 as a colorless foam. The two products were easily separable (7 is much more polar than 8, Analytical Data of the Anomeric Mixture (1:1) of 7 IR (film, 3434, 2936, 1726, 1602, 1453, 1283 cm-1. 1H NMR (300 MHz, CDCl3, δ, 1.19 (d, J= 6.1 Hz, 3 H, 1.27 (d, J= 6.1 Hz, 3 H, 3.38 br s, 1
-
7Na: 485.15707; found: 485.15705.
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40
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49649128020
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Analytical Data of the a-Anomer [α]D20 -148.4 (c 1.90, CDCl3, IR (film, 2943, 2867, 1733, 1672, 1464, 1278 cm-1. 1H NMR (300 MHz, CDCl3, δ, 1.24 (d, J= 6.1 Hz, 3 H, 4.29 (dd, J= 7.8, 3.4 Hz, 1 H, 4.55 (m, 1 H, 4.61 (d, J= 7.8 Hz, 1 H, 4.69 (d, J= 7.8 Hz, 1 H, 4.75-5.81 (m, 2 H, 6.68 (d, J= 3.4 Hz, 1 H, 7.23-7.33 (m, 7 H, 7.43-7.49 (m, 3 H, 7.62 (m, 1 H, 7.80 (m, 2 H, 7.94 (m, 2 H, 8.66 (s, 1 H, 13C NMR 75 MHz, CDCl3, δ, 16.2, 67.8, 70.3, 71.7, 72.3, 72.6, 91.2, 94.5, 127.8, 127.9, 127.9, 128.0, 128.2, 128.3, 128.5, 129.4, 129.5, 129.6, 129.7, 133.0, 133.3, 137.4, 161.4, 165.5, 165.7. ESI-HRMS: m/z calcd for C29H26Cl3NO7Na: 628.06725; found: 628.06734
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7Na: 628.06725; found: 628.06734.
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41
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3543150140
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Gerbst, A. G.; Grachev, A. A.; Ustyuzhanina, N. E.; Khatuntseva, E. A.; Tsvetkov, D. E.; Usov, A. I.; Shaskov, A. S.; Preobrazhenskaya, M. E.; Ushakova, N. A.; Nifantiev, N. E. RUSS. J. Bioorg. Chem. 2004, 30, 137.
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(2004)
RUSS. J. Bioorg. Chem
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, pp. 137
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Gerbst, A.G.1
Grachev, A.A.2
Ustyuzhanina, N.E.3
Khatuntseva, E.A.4
Tsvetkov, D.E.5
Usov, A.I.6
Shaskov, A.S.7
Preobrazhenskaya, M.E.8
Ushakova, N.A.9
Nifantiev, N.E.10
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