2-(trifluoromethylsulfonyloxy)ethyl trifluoromethanesulfonate

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

Procedure: Sodium hydride (60% dispersion in mineral oil, 206 mg, 5.15 mmol) was added at 0° C. to a solution of (1-but-3-enylcarbamoyl-cyclopropyl)-carbamic acid tert-butyl ester (400 mg, 1.57 mmol) in tetrahydrofuran (8 ml), then after 15 min a solution of 1,2-bis(((trifluoromethyl)sulfonyl)oxy)ethane (Chem. Ber. 1981, 114, 810; 616 mg, 1.89 mmol) in tetrahydrofuran (1 ml) was added dropwise. After 1 h, another portion of sodium hydride (60% dispersion in mineral oil, 103 mg, 2.58 mmol) and after 15 min, 1,2-bis(((trifluoromethyl)sulfonyl)oxy)ethane (616 mg, 1.78 mmol) was added, and die reaction mixture was allowed to reach room temperature over 1 h, then partitioned between ethyl acetate and water. The organic layer was washed with brine, dried (MgSO4), and evaporated. Chromatography (SiO2; heptane-ethyl acetate gradient) produced the title compound (208 mg, 47%). Yellow oil, MS (ISP)=281.2 (M+H)+. die reaction mixture to reach room temperature over 1 h partitioned between ethyl acetate and water The organic layer was washed with brine dried (MgSO4) evaporated

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

Procedure: Preparation and handling of organometallic compounds were carried out in the absence of air and moisture under argon (Schlenk technique or glove box). All solvents required were purged with argon and dried over molecular sieves before use. 1,2-Bistrifluoromethylsulfonyloxyethane was synthesized as described by Lindner, Ekkehard; Au, Guenter von; Eberle, Hans-Juergen; Chem.Ber.; 114; 2; 1981; 810-813. The preparations of 1,3-bistrifluoromethylsulfonyloxypropane and 1,2-bistrifluoromethylsulfonyloxycyclohexane were carried out analogously. The indenes used were prepared as described in WO 9840331. All solvents required were purged with argon dried over molecular sieves before use

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

Procedure: Sodium hydride (60% dispersion in mineral oil, 206 mg, 5.15 mmol) was added at 0° C. to a solution of (1-but-3-enylcarbamoyl-cyclopropyl)-carbamic acid tert-butyl ester (400 mg, 1.57 mmol) in tetrahydrofuran (8 ml), then after 15 min a solution of 1,2-bis(((trifluoromethyl)sulfonyl)oxy)ethane (Chem. Ber. 1981, 114, 810; 616 mg, 1.89 mmol) in tetrahydrofuran (1 ml) was added dropwise. After 1 h, another portion of sodium hydride (60% dispersion in mineral oil, 103 mg, 2.58 mmol) and after 15 min, 1,2-bis(((trifluoromethyl)sulfonyl)oxy)ethane (616 mg, 1.78 mmol) was added, and die reaction mixture was allowed to reach room temperature over 1 h, then partitioned between ethyl acetate and water. The organic layer was washed with brine, dried (MgSO4), and evaporated. Chromatography (SiO2; heptane-ethyl acetate gradient) produced the title compound (208 mg, 47%). Yellow oil, MS (ISP)=281.2 (M+H)+. die reaction mixture to reach room temperature over 1 h partitioned between ethyl acetate and water The organic layer was washed with brine dried (MgSO4) evaporated