2-[2-[2-(2-methylsulfonyloxyethoxy)ethoxy]ethoxy]ethyl methanesulfonate

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

Procedure: Sodium azide (1.0 g) is added to a solution of tetraethyleneglycol dimethanesulphonate (5.25 g, 15 mmol), obtained according to A. W. Chwabacher et al. (J. Org. Chem. 1998, 65(5), 1717), in 18 mL of 95° ethanol. The reaction mixture is taken to reflux for 24 hours. Then the solvent is evaporated off, the reaction crude is added to 100 mL of salt water and extracted with ether (3×100 mL). The organic phase is dried over MgSO4, filtered and concentrated under reduced pressure. The residue obtained is purified by chromatography on a silica column using a gradient of AcOEt in hexane (1/1 to 3/1) as eluents. 2-(2-(2-(2-azidoethoxy)ethoxy)ethoxy)ethyl mono-methanesulphonate 47 (2.10 g, 47%) is obtained, which is used directly in the following stage. obtained to reflux for 24 hours Then the solvent is evaporated off the reaction crude extracted with ether (3×100 mL) The organic phase is dried over MgSO4 filtered concentrated under reduced pressure The residue obtained is purified by chromatography on a silica column

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

Procedure: Sodium azide (1.0 g) is added to a solution of tetraethyleneglycol dimethanesulphonate (5.25 g, 15 mmol), obtained according to A. W. Chwabacher et al. (J. Org. Chem. 1998, 65(5), 1717), in 18 mL of 95° ethanol. The reaction mixture is taken to reflux for 24 hours. Then the solvent is evaporated off, the reaction crude is added to 100 mL of salt water and extracted with ether 3×100 mL. The organic phase is dried over MgSO4, filtered and concentrated under reduced pressure. The residue obtained is purified by chromatography on a silica column using a gradient of AcOEt in hexane (1/1 to 3/1) as eluents. 2-(2-(2-(2-azidoethoxy)ethoxy)ethoxy)ethyl mono-methanesulphonate 47 (2.10 g, 47%) is obtained, which is used directly in the following stage. obtained to reflux for 24 hours Then the solvent is evaporated off the reaction crude extracted with ether 3×100 mL The organic phase is dried over MgSO4 filtered concentrated under reduced pressure The residue obtained is purified by chromatography on a silica column

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

Procedure: Sodium azide (1.0 g) is added to a solution of tetraethyleneglycol dimethanesulphonate (5.25 g, 15 mmol), obtained according to A. W. Chwabacher et al. (J. Org. Chem. 1998, 65(5), 1717), in 18 mL of 95° ethanol. The reaction mixture is taken to reflux for 24 hours. Then the solvent is evaporated off, the reaction crude is added to 100 mL of salt water and extracted with ether (3×100 mL). The organic phase is dried over MgSO4, filtered and concentrated under reduced pressure. The residue obtained is purified by chromatography on a silica column using a gradient of AcOEt in hexane (1/1 to 3/1) as eluents. 2-(2-(2-(2-azidoethoxy)ethoxy)ethoxy)ethyl mono-methanesulphonate 47 (2.10 g, 47%) is obtained, which is used directly in the following stage. obtained to reflux for 24 hours Then the solvent is evaporated off the reaction crude extracted with ether (3×100 mL) The organic phase is dried over MgSO4 filtered concentrated under reduced pressure The residue obtained is purified by chromatography on a silica column

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

Procedure: Sodium azide (1.0 g) is added to a solution of tetraethyleneglycol dimethanesulphonate (5.25 g, 15 mmol), obtained according to A. W. Chwabacher et al. (J. Org. Chem. 1998, 65(5), 1717), in 18 mL of 95° ethanol. The reaction mixture is taken to reflux for 24 hours. Then the solvent is evaporated off, the reaction crude is added to 100 mL of salt water and extracted with ether 3×100 mL. The organic phase is dried over MgSO4, filtered and concentrated under reduced pressure. The residue obtained is purified by chromatography on a silica column using a gradient of AcOEt in hexane (1/1 to 3/1) as eluents. 2-(2-(2-(2-azidoethoxy)ethoxy)ethoxy)ethyl mono-methanesulphonate 47 (2.10 g, 47%) is obtained, which is used directly in the following stage. obtained to reflux for 24 hours Then the solvent is evaporated off the reaction crude extracted with ether 3×100 mL The organic phase is dried over MgSO4 filtered concentrated under reduced pressure The residue obtained is purified by chromatography on a silica column

Conditions: temp:5.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A 5,000 mL, 3-necked flask equipped with a mechanical stirrer, thermometer and 500 mL addition funnel was charged with tetraethylene glycol (388 g, 2.0 mol) dichloromethane (1,500 mL) and triethylamine (445 g, 4.40 mol). The mixture was stirred and cooled to ca. 5° C., and methanesulfonyl chloride (470 g, 4.1 mol) was added dropwise over 3 hours. The reaction mixture was stirred an additional 3 hours while warming to 25° C., then water (1,000 mL) was added and the phases were separated. The organic layer was washed with ice-cold 6 N HCl (2×1,000 mL) and then washed with 5% Na2CO3, saturated aqueous NaCl, dried, filtered and evaporated in vacuo to yield 627 g (90%) of tetraethylene glycol dimesylate, i.e., A 5,000 mL, 3-necked flask equipped with a mechanical stirrer thermometer and 500 mL addition funnel The reaction mixture was stirred an additional 3 hours while warming to 25° C. the phases were separated The organic layer was washed with ice-cold 6 N HCl (2×1,000 mL) washed with 5% Na2CO3, saturated aqueous NaCl dried filtered evaporated in vacuo

Conditions: temp:5.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A 5,000 mL, 3-necked flask equipped with a mechanical stirrer, thermometer and 500 mL addition funnel was charged with tetraethylene glycol (388 g, 2.0 mol) dichloromethane (1,500 mL) and triethylamine (445 g, 4.40 mol). The mixture was stirred and cooled to ca. 5° C., and methanesulfonyl chloride (470 g, 4.1 mol) was added dropwise over 3 hours. The reaction mixture was stirred an additional 3 hours while warming to 25° C., then water (1,000 mL) was added and the phases were separated. The organic layer was washed with ice-cold 6N HCl (2×1,000 mL) and then washed with 5% Na2CO3, saturated aqueous NaCl, dried, filtered and evaporated in vacuo to yield 627 g (90%) of tetraethylene glycol dimesylate, i.e., A 5,000 mL, 3-necked flask equipped with a mechanical stirrer thermometer and 500 mL addition funnel The reaction mixture was stirred an additional 3 hours while warming to 25° C. the phases were separated The organic layer was washed with ice-cold 6N HCl (2×1,000 mL) washed with 5% Na2CO3, saturated aqueous NaCl dried filtered evaporated in vacuo

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

Procedure: 15 g of tetraethyleneglycol and 23.4 g of triethylamine were dissolved in 200 mL of dichloromethane, to which 22.1 g of methanesulfonylchloride was added dropwise at 0° C., and then the solution was stirred for 1 hour. The reaction solution was filtrated to remove insolubles, and then the filtrate was concentrated under reduced pressure. The residue was separated with ethyl acetate-water, and the organic layer was concentrated under reduced pressure after washing with water. The residue was purified with silica gel column chromatography to obtain 27 g of the objective compound. was added dropwise at 0° C. The reaction solution was filtrated to remove insolubles the filtrate was concentrated under reduced pressure The residue was separated with ethyl acetate-water the organic layer was concentrated under reduced pressure after washing with water The residue was purified with silica gel column chromatography

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

Procedure: Sodium azide (1.0 g) is added to a solution of tetraethyleneglycol dimethanesulphonate (5.25 g, 15 mmol), obtained according to A. W. Chwabacher et al. (J. Org. Chem. 1998, 65(5), 1717), in 18 mL of 95° ethanol. The reaction mixture is taken to reflux for 24 hours. Then the solvent is evaporated off, the reaction crude is added to 100 mL of salt water and extracted with ether (3×100 mL). The organic phase is dried over MgSO4, filtered and concentrated under reduced pressure. The residue obtained is purified by chromatography on a silica column using a gradient of AcOEt in hexane (1/1 to 3/1) as eluents. 2-(2-(2-(2-azidoethoxy)ethoxy)ethoxy)ethyl mono-methanesulphonate 47 (2.10 g, 47%) is obtained, which is used directly in the following stage. obtained to reflux for 24 hours Then the solvent is evaporated off the reaction crude extracted with ether (3×100 mL) The organic phase is dried over MgSO4 filtered concentrated under reduced pressure The residue obtained is purified by chromatography on a silica column

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

Procedure: Sodium azide (1.0 g) is added to a solution of tetraethyleneglycol dimethanesulphonate (5.25 g, 15 mmol), obtained according to A. W. Chwabacher et al. (J. Org. Chem. 1998, 65(5), 1717), in 18 mL of 95° ethanol. The reaction mixture is taken to reflux for 24 hours. Then the solvent is evaporated off, the reaction crude is added to 100 mL of salt water and extracted with ether 3×100 mL. The organic phase is dried over MgSO4, filtered and concentrated under reduced pressure. The residue obtained is purified by chromatography on a silica column using a gradient of AcOEt in hexane (1/1 to 3/1) as eluents. 2-(2-(2-(2-azidoethoxy)ethoxy)ethoxy)ethyl mono-methanesulphonate 47 (2.10 g, 47%) is obtained, which is used directly in the following stage. obtained to reflux for 24 hours Then the solvent is evaporated off the reaction crude extracted with ether 3×100 mL The organic phase is dried over MgSO4 filtered concentrated under reduced pressure The residue obtained is purified by chromatography on a silica column