反应详情

温度

-78 °C

t-BuLi (1.7 M in pentatne, 63 mL, 106 mmol, 2.1 equiv) was added dropwise to a cold (−78° C.) solution of 3,5-dimethoxy-bromobenzene (11 g, 50.7 mmol) in THF (400 mL), under an argon atmosphere. The yellow mixture si stirred for 45 min at −78° C. Trimethyl borate (20 mL, 179 mmol, 3.5 equiv) was then added. The colorless reaction mixture was allowed to warm to 0° C., quenched by addition of a saturated solution of NH4Cl (5 mL), and concentrated. The residue was diluted with EtOAc/NH4Cl (saturated aqueous solution), and extracted with EtOAc. The organic phase was dried (Na2SO4), filtered and concentrated. The residue was triturated in Et2O to provide 6.8 g of the title compound as a white solid: ESI-MS: 183.1 [M+H]+; tR=2.70 min (System 1).

1. temperatureto warm to 0° C.
2. customquenched by addition of a saturated solution of NH4Cl (5 mL)
3. concentrationconcentrated
4. additionThe residue was diluted with EtOAc/NH4Cl (saturated aqueous solution)
5. extractionextracted with EtOAc
6. dry with materialThe organic phase was dried (Na2SO4)
7. filtrationfiltered
8. concentrationconcentrated
9. customThe residue was triturated in Et2O