反应详情

温度

-78 °C

[(3,5-Dichlorobenzyl)oxy](triisopropyl)silane (14.8 g, 44.4 mmol) was stirred in tetrahydrofuran (30 mL) and cooled to −78° C. A solution of n-butyllithium (30.5 mL, 1.6 M in hexane, 48.8 mmol) was added dropwise and the mixture was stirred at −78° C. for 1 hour. N,N-dimethylformamide (4.47 mL, 57.7 mmol) was added and the mixture was allowed to warm to room temperature. A solution of 1 N HCl saturated with NaCl (15 mL) was added. The organic layer was separated and concentrated. The crude product was purified by chromatography on silica gel eluting with hexane to 10% ethyl acetate/hexane. Pure fractions were combined and concentrated to provide the desired product as a white solid (13.0 g, 81%). 1H NMR (CDCl3) δ 10.43 (s, 1H), 7.39 (s, 2H), 4.80 (s, 2H), 1.18 (m, 3H), 1.03 (s, 18H). LC/MS: 361 (M+H)+.

1. temperatureto warm to room temperature
2. customThe organic layer was separated
3. concentrationconcentrated
4. customThe crude product was purified by chromatography on silica gel eluting with hexane to 10% ethyl acetate/hexane
5. concentrationconcentrated