反应详情

tert-Butyl 4-(2-hydroxyethyl)piperazine-1-carboxylate (5.76 g, 25.0 mmol) was dissolved in dry tetrahydrofuran (100 mL) and carbon tetrabromide (9.12 g, 27.5 mmol). A solution of triphenyl phosphine (6.62 g, 25.3 mmol) in dry tetrahydrofuran (25 mL) was added dropwise, and the mixture was stirred for 20 hours. The reaction was diluted with n-hexane (100 mL) and washed with a saturated NaHCO3 solution, water and brine, dried with MgSO4, filtered and concentrated. Silica gel chromatography eluting with ethyl acetate/hexanes 1:4 gave the title compound. MS (DCI) m/z 295 (M+H)+.

1. washwashed with a saturated NaHCO3 solution, water and brine
2. dry with materialdried with MgSO4
3. filtrationfiltered
4. concentrationconcentrated
5. washSilica gel chromatography eluting with ethyl acetate/hexanes 1:4