反应详情

A solution of 2.50 g (11.6 mmol ) of 2-(2-bromophenyl)imidazole in 10 mL of methylene chloride was treated with 1.9 mL of triethylamine (13.8 mmol), 2.64 g (13.8 mmol) of p-toluenesulfonyl chloride and 100 mg of 4-dimethylaminopyridine. The reaction mixture was stirred at room temperature for 15 minutes then transferred to a separatory funnel and washed with water, 5% aqueous citric acid, saturated aqueous sodium bicarbonate and saturated aqueous sodium chloride. The organic layer was removed, dried over magnesium sulfate, filtered and solvents removed under vacuum. The crude product was chromatographed on silica, eluting with hexane/ethyl acetate (1:1), to give 4.16 g (11.0 mmol 95%) of the product which was recrystallized from hexane. FAB-MS: calculated for C16H13BrN2O2S 376,378; found 377,379 (M+H, 50%). 1H NMR (200 MHz, CDCl3): 2.32 (s, 3H), 7.09 (d, 2 Hz, 1H), 7.12 (d, 8 Hz, 2H), 7.28 (m, 5H), 7.46 (m, 1H), 7.57 (d, 2 Hz, 1H).

1. customthen transferred to a separatory funnel
2. washwashed with water, 5% aqueous citric acid, saturated aqueous sodium bicarbonate and saturated aqueous sodium chloride
3. customThe organic layer was removed
4. dry with materialdried over magnesium sulfate
5. filtrationfiltered
6. customsolvents removed under vacuum
7. customThe crude product was chromatographed on silica
8. washeluting with hexane/ethyl acetate (1:1)
9. customto give 4.16 g (11.0 mmol 95%) of the product which
10. customwas recrystallized from hexane