反应详情

A dry 500 mL three-necked flask was charged with 2-bromo-4,5-dimethoxyaniline (23.4 g, 0.10 mol) and t-BuOMe (200 mL), NaOH (25.3 g, 25%, 0.158 mol) was added in portions at 0° C. Then pivaloyl chloride (12.9 g, 0.106 mol) was added dropwise slowly under N2 at 0° C. After addition, the mixture was stirred for an additional 1 hour and diluted with water (100 mL), acidified by 5% HCl to pH=7 and extracted with EtOAc (100 mL×3). The combined organic layers were washed with water (100 mL×3), dried over anhydrous MgSO4, filtrated and concentrated in vacuum to afford the compound N-(2-bromo-4,5-dimethoxyphenyl)-2,2-dimethylpropanamide. MS (M+H)=316 and 318.

1. additionwas added in portions at 0° C
2. additionAfter addition
3. extractionextracted with EtOAc (100 mL×3)
4. washThe combined organic layers were washed with water (100 mL×3)
5. dry with materialdried over anhydrous MgSO4
6. filtrationfiltrated
7. concentrationconcentrated in vacuum