吡喃甘露糖,五乙酸酯,β-d-

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A 19.5 g (0.05 mole) quantity of penta-O-acetyl-β-D-mannopyranose and 13.9 g (0.10 mole) of p-nitrophenol were heated at 130° C. under reduced pressure of 20 mmHg. To the melt obtained were added 0.25 g of 12-molybdophosphoric acid and 0.05 g of zinc acetate and the mixture was reacted under reduced pressure for 30 minutes. The reaction mixture was dissolved in 100 ml of toluene and the solution was washed with 6 portions of 50 ml of 1.0M-NaoH aqueous solution and with 2 portions of 50 ml of water. After the toluene layer was evaporated to dryness under reduced pressure, the semisolid obtained was purified by silica gel column chromatography using toluene-acetone (20 : 1, v/v) as an eluent, giving 12.2 g of p-nitrophenyl 2,3,4,6-tetra-O-acetyl-β-D-mannopyranoside in a yield of 52.0%. M.p. 142° to 143° C. To the melt obtained the mixture was reacted under reduced pressure for 30 minutes the solution was washed with 6 portions of 50 ml of 1.0M-NaoH aqueous solution and with 2 portions of 50 ml of water After the toluene layer was evaporated to dryness under reduced pressure the semisolid obtained was purified by silica gel column chromatography

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A 19.5 g (0.05 mole) quantity of penta-O-acetyl-β-D-mannopyranose and 13.9 g (0.10 mole) of p-nitrophenol were heated at 130° C. under reduced pressure of 20 mmHg. To the melt obtained were added 0.25 g of 12-molybdophosphoric acid and 0.05 g of zinc acetate and the mixture was reacted under reduced pressure for 30 minutes. The reaction mixture was dissolved in 100 ml of toluene and the solution was washed with 6 portions of 50 ml of 1.0M-NaoH aqueous solution and with 2 portions of 50 ml of water. After the toluene layer was evaporated to dryness under reduced pressure, the semisolid obtained was purified by silica gel column chromatography using toluene-acetone (20 : 1, v/v) as an eluent, giving 12.2 g of p-nitrophenyl 2,3,4,6-tetra-O-acetyl-β-D-mannopyranoside in a yield of 52.0%. M.p. 142° to 143° C. To the melt obtained the mixture was reacted under reduced pressure for 30 minutes the solution was washed with 6 portions of 50 ml of 1.0M-NaoH aqueous solution and with 2 portions of 50 ml of water After the toluene layer was evaporated to dryness under reduced pressure the semisolid obtained was purified by silica gel column chromatography