反应详情

To a solution of tert-butyl 1-amino-2-methyl-1-oxopropan-2-ylcarbamate (Example 12 a, 12.5 g) and triethylamine (CAN 121-44-8, 29 g) in methylene chloride (150 mL) was added trifluoroacetic acid anhydride (CAN 407-25-0, 27.2 g) dropwise at 0° C. The resulting mixture was allowed to warm to room temperature and stirred for 4 h. After that the mixture was washed with water, 5 N citric acid and brine, the organic phase was dried over anhydrous sodium sulfate and concentrated to give the title compound (11 g, 97%) as a yellow solid; MS: m/e=207.1 [M+Na]+.

1. washAfter that the mixture was washed with water, 5 N citric acid and brine
2. dry with materialthe organic phase was dried over anhydrous sodium sulfate
3. concentrationconcentrated