Carbon Tetrachloride → 1,3,4,6-Tetra-O-acetyl-2-azido-2-deoxyhexopyranose

Participants

Reaction Conditions

Reaction Steps

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)).

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