Imidazole → (4-Bromo-phenoxy)-triisopropylsilane

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of p-bromophenol (5) (4.0 g, 23.1 mmol) in DCM (40 ml) was added triisopropylsilyl chloride (5 ml, 23.4 mmol). The reaction mixture was cooled to 0° C. and imidazole (3.94 g, 57.9 mmol) was added and the mixture was stirred at 0° C. for 30 minutes then allowed to warm to ambient temperature over 12 hours. The reaction mixture was diluted with ether and sequentially washed with 0.5 M HCl (2×), sat. aq. NaHCO3, water and brine then dried over MgSO4. The crude product was purified by bulb to bulb distillation (boiling point: 149–150° C. at 2.0 mmHg) to give 6 as a clear oil (6.23 g, 82% yield): 1H-NMR (400 MHz, chloroform-d) δ7.30 (d, J=8.8 Hz, 2H), 6.75 (d, J=8.8 Hz, 2H), 1.24 (septet, J=7.2 Hz, 3H), 1.09 (d, J=7.2 Hz, 18H); 13C-NMR (100 MHz, chloroform-d) δ155.2, 132.2, 121.7, 113.2, 17.8, 12.6; FTIR (thin film) 2945, 2892, 2867, 1586, 1487, 1274, 909, 883, 828, 732 cm−1; HRMS (EI+) for C15H25BrOSi calcd. 328.0858 found 328.0844.

Provenance & Evidence