反应详情

(S)-2-hydroxy-N,3-bis(4-methoxyphenyl)-2-methylpropanamide (6c) (0.20 g, 0.63 mmol) was dissolved in dry CH2Cl2 (20 mL). BBr3 (6 mL of 1.0 M CH2Cl2 solution) was added dropwise with stirring via a syringe at room temperature. The reaction solution was allowed to stir overnight at room temperature. The mixture was cooled to 0° C. in a ice bath and hydrolyzed by adding water (25 mL). EtOAc (50 mL) was added to partition the solution. The organic layer was separated; the aqueous layer was extracted with EtOAc (2×10 mL). The organic layers were combined, washed with brine and dried over anhydrous MgSO4. The solvent was removed under vacuum. The residue was purified by flash column chromatography using silica-gel with hexanes/EtOAc (3/7 v/v) to afford a white solid product, (S)-2-hydroxy-N,3-bis(4-hydroxyphenyl)-2-methylpropanamide (6g), 0.12 g, 65.6% yield.

1. stirringto stir overnight at room temperature
2. temperatureThe mixture was cooled to 0° C. in a ice bath
3. customto partition the solution
4. customThe organic layer was separated
5. extractionthe aqueous layer was extracted with EtOAc (2×10 mL)
6. washwashed with brine
7. dry with materialdried over anhydrous MgSO4
8. customThe solvent was removed under vacuum
9. customThe residue was purified by flash column chromatography