反应详情

Sodium hydride (60% dispersion in oil; 2.0 g, 50 mmol) was added to a stirred solution of N-6-bromohexanoyl-L-leucine ethyl ester (15.0 g, 45 mmol) in anhydrous THF (150 ml) at 0° C. After the effervesence had ceased methyl iodide (8.4 ml) was added. The reaction mixture was allowed to warm up to room temperature and was stirred overnight. The solvent was removed under reduced pressure and the residue taken up in ethyl acetate, washed with brine, dried over anhydrous sodium sulphate, filtered and concentrated to give crude N-methyl-N-6-bromohexanoyl-L-leucine ethyl ester (14.0 g, 89%) as a pale yellow oil which was used directly in the next step.

1. additionwas added
2. customThe solvent was removed under reduced pressure
3. washwashed with brine
4. dry with materialdried over anhydrous sodium sulphate
5. filtrationfiltered
6. concentrationconcentrated