1,3,4,6-Tetra-O-acetyl-2-azido-2-deoxy-beta-D-glucopyranose

Conditions: temp:25.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 1,3,4,6-Tetra-O-acetyl-2-O-trifluormethanesulfonyl-β-D-mannopyranose (6) (53 mg, 0.11 mmol) was dissolved at 25° C. in 3 mL of THF. Trimethylsilyl azide (19 μL, 0.15 mmol) was added via syringe followed by TBAF (150 μL, 0.15 mmol). The solution was stirred at 25° C. for 22 h. The reaction mixture was filtered through a plug of silica gel and concentrated in vacuo to give a yellow oil which was chromatographed (2:1, hexane/EtOAc) to afford 30 mg (73%) of β-anomer as a colorless oil. IR (CCl4) 2113, 1762; 1H NMR (CDCl3) 5.56 (d, J=8.8), 5.10 (t, J=9.5), 5.05 (t, J=9.5), 4.31 (dd, J=4.8, 12.5), 4.09 (dd, J=12.5), 3.79 (ddd, J=9.5, 4.8, 2.0), 3.65 (dd, J=9.5, 8.8), 2.18 (s, 3H), 2.08 (s, 3H), 2.06 (s, 3H), 2.01 (s, 3H). The spectra for the anomeric mixture has been previously reported (Vasella, A. et al., Helv. Chim. Acta 74:2073-2077 (1991)). The reaction mixture was filtered through a plug of silica gel concentrated in vacuo to give a yellow oil which was chromatographed (2:1, hexane/EtOAc) to afford 30 mg (73%) of β-anomer as a colorless oil

Conditions: temp:25.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 1,3,4,6-Tetra-O-acetyl-2-O-trifluormethanesulfonyl-β-D-mannopyranose (6) (53 mg, 0.11 mmol) was dissolved at 25° C. in 3 mL of THF. Trimethylsilyl azide (19 μL, 0.15 mmol) was added via syringe followed by TBAF (150 μL, 0.15 mmol). The solution was stirred at 25° C. for 22 h. The reaction mixture was filtered through a plug of silica gel and concentrated in vacuo to give a yellow oil which was chromatographed (2:1, hexane/EtOAc) to afford 30 mg (73%) of β-anomer as a colorless oil. IR (CCl4) 2113, 1762; 1H NMR (CDCl3) 5.56 (d, J=8.8), 5.10 (t, J=9.5), 5.05 (t, J=9.5), 4.31 (dd, J=4.8, 12.5), 4.09 (dd, J=12.5), 3.79 (ddd, J=9.5, 4.8, 2.0), 3.65 (dd, J=9.5, 8.8), 2.18 (s, 3H), 2.08 (s, 3H), 2.06 (s, 3H), 2.01 (s, 3H). The spectra for the anomeric mixture has been previously reported (Vasella, A. et al., Helv. Chim. Acta 74:2073-2077 (1991)). The reaction mixture was filtered through a plug of silica gel concentrated in vacuo to give a yellow oil which was chromatographed (2:1, hexane/EtOAc) to afford 30 mg (73%) of β-anomer as a colorless oil

Conditions: temp:45.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 2-azido glucose tetraacetate 57 (0.222 g, 0.59 mmol) in 6.6 mL of CH2Cl2 is added 4-hydroxythiophenol (0.146 g, 1.15 mmol) followed by boron trifluoride diethyl ether complex (15.9 mL, 18.4 g. 141 mmol). The reaction mixture is heated at 45° C. for 12 h and then quenched by the addition of 2 mL of H2O. The reaction mixture is diluted with 25 mL of CH2Cl2, washed with H2O (10 mL), saturated NaCl (10 mL), dried over Na2SO4, filtered, and concentrated to afford 0.232 g of crude 2-azido-1,2-dideoxy-1-(4-hydroxyphenylthio)-3,4,6-tri-O-acetyl-α,β-D-glucopyranose 58 as a yellow oil, a mixture of anomers which is then taken on to the next step without further purification. quenched by the addition of 2 mL of H2O The reaction mixture is diluted with 25 mL of CH2Cl2 washed with H2O (10 mL), saturated NaCl (10 mL) dried over Na2SO4 filtered concentrated

Conditions: temp:40.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of mannose triflate 56 (1.28 g, 2.66 mmol) in 14 mL of DMF is added sodium azide (0.69 g, 10.5 mmol). The reaction mixture is heated at 40° C. for 1.75 h, cooled to room temperature, diluted with 100 mL of CH2Cl2, washed with H2O (100 mL), saturated NaCl (100 mL), dried over MgSO4, filtered, and concentrated to afford a yellow oil. The product is purified by flash chromatography (33% EtOAc/hexane) to afford 0.80 g (81%) of 2-azido-2-deoxy-1,3,4,6-tetra-O-acetyl-β-D-glucopyranose 57: Rf 0.31 (33% EtOAc/hexane) δ 5.55 (d, J=8.6 Hz, 1H, H-1), 5.015.15 (m, 2H, H-3, H-4), 4.31 (dd, J=12.7, 4.5 Hz, 1H, H-6), 4.08 (d, J=12.5 Hz, 1H, H-6), 3.77-3.84 (m, 1H, H-5), 3.69 (app t, J=9.1 Hz, 1H, H-2), 2.10 (s, 3H), 2.08 (s, 3H), 2.05 (s, 3H), 2.03 (s, 3H). cooled to room temperature washed with H2O (100 mL), saturated NaCl (100 mL) dried over MgSO4 filtered concentrated to afford a yellow oil The product is purified by flash chromatography (33% EtOAc/hexane)