反应详情

To a solution of 4-[2-(tert-butyl-dimethyl-silanyloxy)-1,1-dimethyl-ethyl]-phenylamine (as prepared in the previous step, 1.41 g, 5.04 mmol) in 25 mL of DCM at 0° C. was slowly added N-bromosuccinimide (NBS) (898 mg, 5.04 mmol) in three portions over five minutes. After stirring at RT for 2 h, the mixture was treated with 50 mL of EtOAc and washed with H2O (2×30 mL) and brine H2O (20 mL). The organic layer was dried (Na2SO4) and concentrated in vacuo. The residue was purified by flash chromatography on silica gel (DCM) to give 1.59 g (88%) of the title compound as a light yellow oil. Mass spectrum (ESI, m/z): Calcd. for C16H28BrNOSi, 358.1 (M+H). found 358.4.

1. customover five minutes
2. washwashed with H2O (2×30 mL) and brine H2O (20 mL)
3. dry with materialThe organic layer was dried (Na2SO4)
4. concentrationconcentrated in vacuo
5. customThe residue was purified by flash chromatography on silica gel (DCM)