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0 °C

To a slurry of cis-2-(4-bromophenoxy)cyclopentanamine (1.43 g, 5.58 mmol) in methylene chloride (38.5 mL) was added 1,8-diazabicyclo[5.4.0]undec-7-ene (1.40 mL, 9.36 mmol), then 4-(dimethylamino)pyridine (915 mg, 7.49 mmol). The reaction mixture was cooled to 0° C. and propane-2-sulfonyl chloride (0.937 mL, 8.38 mmol) was added drop-wise. The mixture was then allowed to warm to room temperature and stir for 18 hours. The reaction was treated with 1N aqueous hydrochloric acid, and the organic layer was washed with saturated aqueous sodium chloride solution, dried over calcium sulfate, filtered and concentrated in vacuo. The resulting residue was purified by silica gel chromatography (Gradient: 0% to 15% ethyl acetate in heptane) to provide product as a colorless gum. Yield: 1.586 g, 4.38 mmol, 78%.

1. temperatureto warm to room temperature
2. washthe organic layer was washed with saturated aqueous sodium chloride solution
3. dry with materialdried over calcium sulfate
4. filtrationfiltered
5. concentrationconcentrated in vacuo
6. customThe resulting residue was purified by silica gel chromatography (Gradient: 0% to 15% ethyl acetate in heptane)
7. customto provide product as a colorless gum