2-methylsulfonyloxyethyl methanesulfonate

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

Procedure: Potassium carbonate (6.7 g, 48.5 mmol) and diisopropylethylamine (0.3 g, 2.3 mmol) were suspended in dichloromethane-toluene (1/1, 10 mL), and ethylene glycol (1.5 g, 23.3 mmol) and methanesulfonyl chloride (5.5 g, 48.0 mmol) were dropped at the same time in an ice bath. A reaction was effected at room temperature for 3 hours and, thereafter, the reaction was terminated by addition to ice water. An organic layer separated through liquid separation was concentrated, so as to obtain the desired product, 1,2-bis(methanesulfonyloxy)ethane, at a yield of 36% (1.8 g, 8.4 mmol). The measurement result of 1H NMR is as described below. the reaction was terminated by addition to ice water An organic layer separated through liquid separation was concentrated

Conditions: temp:70.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a vigorously stirred solution of 15,2 g (100 mmol) 2-hydroxy-5-methoxy-benzaldehyde and 42.4 g (130 mmol) caesium carbonate in 350 ml DMF at 0° C. was added 27,3 g (125 mmol) 1,2-bis-methanesulfonyloxy-ethane ((J. Med. Chem.; 47; 17; (2004); 4300-4315) in 50 ml DMF dropwisely. The reaction mixture was stirred vigorously at 70° C. for 5 h. The solvent was evaporated. 200 ml water and 200 ml ethyl acetate were added. The organic phase was separated. The aqueous phase was extracted three times with 100 ml ethyl acetate each. The combined organic phases were washed with 50 ml water and 50 ml brine. The organic phase was dried with magnesium sulfate and evaporated. The crude product was purified by silica column chromatography (gradient ethylacetate:hexane 1:6, ethyl acetate→1:2). The desired product 4a was obtained in 78% yield (21.4 g, 78 mmol) as yellow oil. The solvent was evaporated 200 ml water and 200 ml ethyl acetate were added The organic phase was separated The aqueous phase was extracted three times with 100 ml ethyl acetate each The combined organic phases were washed with 50 ml water and 50 ml brine The organic phase was dried with magnesium sulfate evaporated The crude product was purified by silica column chromatography (gradient ethylacetate:hexane 1:6, ethyl acetate→1:2)

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

Procedure: Potassium carbonate (6.7 g, 48.5 mmol) and diisopropylethylamine (0.3 g, 2.3 mmol) were suspended in dichloromethane-toluene (1/1, 10 mL), and ethylene glycol (1.5 g, 23.3 mmol) and methanesulfonyl chloride (5.5 g, 48.0 mmol) were dropped at the same time in an ice bath. A reaction was effected at room temperature for 3 hours and, thereafter, the reaction was terminated by addition to ice water. An organic layer separated through liquid separation was concentrated, so as to obtain the desired product, 1,2-bis(methanesulfonyloxy)ethane, at a yield of 36% (1.8 g, 8.4 mmol). The measurement result of 1H NMR is as described below. the reaction was terminated by addition to ice water An organic layer separated through liquid separation was concentrated