Ammonia → HCID 131719636, compound

Participants

Reaction Steps

1.09 g (1.41 mmol)of 1,6-anhydro-4-O-benzyl-2-deoxy-2-[1D-(1N,2,4/3)-2,3,4-tri-O-benzyl-5-C-benzyloxymethyl-2,3,4-trihydroxy-5-cyclohexen-1-yl)amino]-β-D-glucopyranose (compound 3) was dissolved in THF (20 ml) and liquid ammonia (~100 ml) was added at -78° C. Sodium (0.42 g) was added and the reaction mixture was stirred for 30 minutes at this temperature. NH4Cl(2 g) was then added and ammonia and THF were evaporated at room temperature. The residue was acetylated in pyridine (5 ml) and acetic anhydride (5 ml). Excess of acetic anhydride was quenched by the addition of methanol. The reaction mixture was evaporated and dissolved in dichloromethane (100 ml) and washed sequentially with 5% HCl solution (2×100 ml), saturated NaHCO3 solution (2×100 ml) and water (2×100 ml) before evaporation to a syrup. The syrup was purified by chromatography on silica gel using toluene:ethylacetate (3:1) as eluent to provide 1,6-anhydro-3-4-di-O-acetyl-2-deoxy-2-[1D-(1N,2,4/3)-(2,3,4-tri-O-acetyl-5-C-acetoxymethyl-2,3,4-trihydroxy-5-cyclohexen-1-yl)amino]-β-D-glucopyranose (compound 4) (613 mg, 75.8%).

Provenance & Evidence