(2R,3S,4S,5R,6S)-2-(hydroxymethyl)-6-prop-2-enoxyoxane-3,4,5-triol

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

Procedure: A solution of allyl α-D-glucopyranoside (1) (prepared according to R. E. Wing, J. N. BeMiller, Carbohydr. Res. 1969, 10, 441) (12.5 g, 56.8 mmol) and triphenylmethyl chloride (20.0 g, 71.7 mmol) in dry pyridine (120 ml) was stirred at r.t. for 12 h, and at 60° for 1 h. After the addition of triphenylmethyl chloride (12.0 g, 43.0 mmol), the solution was stirred at 60° until all starting material has disappeared (3-4 h). H2O (120 ml) was added to the still warm solution. Extraction with EtOAc, extraction of the combined org. layers with 1M aq. H2SO4 and brine, evaporation of the organic layer and FC (400 g SiO2, toluene/actone 2:1→toluene/acetone 1:1) gave 23.3 g (90%) of 2. Grey glassy solid. (3-4 h) Extraction with EtOAc, extraction of the combined org layers with 1M aq. H2SO4 and brine, evaporation of the organic layer and FC (400 g SiO2, toluene/actone 2:1→toluene/acetone 1:1)

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

Procedure: A solution of allyl α-D-glucopyranoside (1) (prepared according to R. E. Wing, J. N. BeMiller, Carbohydr. Res. 1969, 10, 441) (12.5 g, 56.8 mmol) and triphenylmethyl chloride (20.0 g, 71.7 mmol) in dry pyridine (120 ml) was stirred at r.t. for 12 h, and at 60° for 1 h. After the addition of triphenylmethyl chloride (12.0 g, 43.0 mmol), the solution was stirred at 60° until all starting material has disappeared (3-4 h). H2O (120 ml) was added to the still warm solution. Extraction with EtOAc, extraction of the combined org. layers with 1M aq. H2SO4 and brine, evaporation of the organic layer and FC (400 g SiO2, toluene/actone 2:1→toluene/acetone 1:1) gave 23.3 g (90%) of 2. Grey glassy solid. (3-4 h) Extraction with EtOAc, extraction of the combined org layers with 1M aq. H2SO4 and brine, evaporation of the organic layer and FC (400 g SiO2, toluene/actone 2:1→toluene/acetone 1:1)

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

Procedure: A solution of allyl α-D-glucopyranoside (1) (prepared according to R. E. Wing, J. N. BeMiller, Carbohydr. Res. 1969, 10, 441) (12.5 g, 56.8 mmol) and triphenylmethyl chloride (20.0 g, 71.7 mmol) in dry pyridine (120 ml) was stirred at r.t. for 12 h, and at 60° for 1 h. After the addition of triphenylmethyl chloride (12.0 g, 43.0 mmol), the solution was stirred at 60° until all starting material has disappeared (3-4 h). H2O (120 ml) was added to the still warm solution. Extraction with EtOAc, extraction of the combined org. layers with 1M aq. H2SO4 and brine, evaporation of the organic layer and FC (400 g SiO2, toluene/actone 2:1→toluene/acetone 1:1) gave 23.3 g (90%) of 2. Grey glassy solid. (3-4 h) Extraction with EtOAc, extraction of the combined org layers with 1M aq. H2SO4 and brine, evaporation of the organic layer and FC (400 g SiO2, toluene/actone 2:1→toluene/acetone 1:1)

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

Procedure: Into 200 mL of anhydrous pyridine, 6.3 g (28.6 mmol) of the compound (IV) was dissolved, and 195 mg of p-dimethylaminopyridine (DMAP) and 7.0 g of p-toluenesulfonyl chloride were added. The solution was reacted for 16 hours at room temperature while stirring. Thereafter, the reaction was quenched by adding 20 mL of cold distilled water, and the reaction mixture was extracted with ethyl acetate (3×200 mL). The organic layers were combined, neutralized to pH 4 with 1.0 M and 0.1 M hydrochloric acids, washed with brine (2×200 mL), dried over anhydrous sodium sulfate, filtered, concentrated in vacuo, and purified by silica gel flash chromatography (dichloromethane:methanol=20:1) (yield: 8.6 mg (23.0 mmol), recovery: 83.8%). The solution was reacted for 16 hours at room temperature Thereafter, the reaction was quenched by adding 20 mL of cold distilled water the reaction mixture was extracted with ethyl acetate (3×200 mL) washed with brine (2×200 mL) dried over anhydrous sodium sulfate filtered concentrated in vacuo purified by silica gel flash chromatography (dichloromethane:methanol=20:1) (yield: 8.6 mg (23.0 mmol), recovery: 83.8%)

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

Procedure: Into 200 mL of anhydrous pyridine, 6.3 g (28.6 mmol) of the compound (IV) was dissolved, and 195 mg of p-dimethylaminopyridine (DMAP) and 7.0 g of p-toluenesulfonyl chloride were added. The solution was reacted for 16 hours at room temperature while stirring. Thereafter, the reaction was quenched by adding 20 mL of cold distilled water, and the reaction mixture was extracted with ethyl acetate (3×200 mL). The organic layers were combined, neutralized to pH 4 with 1.0 M and 0.1 M hydrochloric acids, washed with brine (2×200 mL), dried over anhydrous sodium sulfate, filtered, concentrated in vacuo, and purified by silica gel flash chromatography (dichloromethane:methanol=20:1) (yield: 8.6 mg (23.0 mmol), recovery: 83.8%). The solution was reacted for 16 hours at room temperature Thereafter, the reaction was quenched by adding 20 mL of cold distilled water the reaction mixture was extracted with ethyl acetate (3×200 mL) washed with brine (2×200 mL) dried over anhydrous sodium sulfate filtered concentrated in vacuo purified by silica gel flash chromatography (dichloromethane:methanol=20:1) (yield: 8.6 mg (23.0 mmol), recovery: 83.8%)