甲基-PEG4-NHS酯

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

实验步骤: tert-Butyl 3-{2-[2-(2-Methoxyethoxy)ethoxy]ethoxy}propionate (131 mg, 0.45 mmol) was dissolved in trifluoroacetic acid and left at room temperature for 1 hour. The solvent was removed in vacuo and residual trifluoroacetic acid was removed by evaporation from dioxane. The deprotected intermediate was dissolved in dichloromethane and treated with N-hydroxysuccinimide (57 mg, 0.49 mmol) and ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (86 mg, 0.45 mmol) and stirred at room temperature overnight. The reaction mixture was diluted with dichloromethane and washed twice with water. The organic phase was dried over MgSO4 and concentrated in vacuo to provide 122 mg (82%). The solvent was removed in vacuo and residual trifluoroacetic acid was removed by evaporation from dioxane The deprotected intermediate was dissolved in dichloromethane washed twice with water The organic phase was dried over MgSO4 concentrated in vacuo to provide 122 mg (82%)

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

实验步骤: tert-Butyl 3-{2-[2-(2-Methoxyethoxy)ethoxy]ethoxy}propionate (131 mg, 0.45 mmol) was dissolved in trifluoroacetic acid and left at room temperature for 1 hour. The solvent was removed in vacuo and residual trifluoroacetic acid was removed by evaporation from dioxane. The deprotected intermediate was dissolved in dichloromethane and treated with N-hydroxysuccinimide (57 mg, 0.49 mmol) and ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (86 mg, 0.45 mmol) and stirred at room temperature overnight. The reaction mixture was diluted with dichloromethane and washed twice with water. The organic phase was dried over MgSO4 and concentrated in vacuo to provide 122 mg (82%). The solvent was removed in vacuo and residual trifluoroacetic acid was removed by evaporation from dioxane The deprotected intermediate was dissolved in dichloromethane washed twice with water The organic phase was dried over MgSO4 concentrated in vacuo to provide 122 mg (82%)

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

实验步骤: tert-Butyl 3-{2-[2-(2-Methoxyethoxy)ethoxy]ethoxy}propionate (131 mg, 0.45 mmol) was dissolved in trifluoroacetic acid and left at room temperature for 1 hour. The solvent was removed in vacuo and residual trifluoroacetic acid was removed by evaporation from dioxane. The deprotected intermediate was dissolved in dichloromethane and treated with N-hydroxysuccinimide (57 mg, 0.49 mmol) and ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (86 mg, 0.45 mmol) and stirred at room temperature overnight. The reaction mixture was diluted with dichloromethane and washed twice with water. The organic phase was dried over MgSO4 and concentrated in vacuo to provide 122 mg (82%). The solvent was removed in vacuo and residual trifluoroacetic acid was removed by evaporation from dioxane The deprotected intermediate was dissolved in dichloromethane washed twice with water The organic phase was dried over MgSO4 concentrated in vacuo to provide 122 mg (82%)