反应详情

温度

0 °C

To a solution of 1-(3-methoxy-5,5,8,8-tetramethyl-5,6,7,8-tetrahydro-naphthalen-2-yl)-ethanone (Intermediate 3, 10.7 g, 41.2 mmol) in CH2Cl2 (500 mL) at 0° C. was added BBr3 (49.5 mL, 1.0 M in CH2Cl2) via syringe pump over 10 min. The mixture was stirred at 0° C. for 2 h and was quenched with ice-H2O and extracted with Et2O (×3). The combined organic layer was washed with brine, dried over Na2SO4, and concentrated in vacuo. The residue was purified by flash column chromatography on silica gel (CH2Cl2) to give the title compound as a brown solid (7.6 g, 75%).

1. customwas quenched with ice-H2O
2. extractionextracted with Et2O (×3)
3. washThe combined organic layer was washed with brine
4. dry with materialdried over Na2SO4
5. concentrationconcentrated in vacuo
6. customThe residue was purified by flash column chromatography on silica gel (CH2Cl2)