反应详情

To a solution of TMEDA (3.9 mL, 3.0 g, 26 mmol) in THF (33 mL) at −78° C. was added sec butyllithium (20 mL, 1.3 M in hexane, 26 mmol). After stirring for 20 minutes, a solution of tert-butyl-(2,3-difluoro-benzyloxy)-dimethyl-silane (6.0 g, 23 mmol) in 17 mL of THF was added dropwise. After stirring for 1 hour, the solution was added dropwise to a solution of methyl iodide (8 mL) in THF (40 mL) at −20° C. After stirring for 18 hours, the mixture was quenched with saturated aqueous NH4Cl, extracted 3× into ether, and the combined organic layers were dried over MgSO4, filtered and concentrated in vacuo, giving 6.6 g of tert-butyl-(2,3-difluoro-4-methyl-benzyloxy)-dimethyl-silane as a light yellow oil. 1H NMR (400 MHz, CDCl3) δ 7.07 (app. t, 1H, J=7.2 Hz), 6.89 (app. t, 1H, J=7.3 Hz), 4.74 (s, 2H), 2.26 (d, 3H, J=1.9 Hz), 0.87 (s, 9H), 0.07 (s, 6H) ppm.

1. stirringAfter stirring for 1 hour
2. stirringAfter stirring for 18 hours
3. customthe mixture was quenched with saturated aqueous NH4Cl
4. extractionextracted 3× into ether
5. dry with materialthe combined organic layers were dried over MgSO4
6. filtrationfiltered
7. concentrationconcentrated in vacuo