反应详情

To a mixture of 2-benzyloxycarbonylamino-2-cyanoacetic acid (2.00 g, 8.54 mmol), toluene (20 ml) and t-butyl alcohol (6.33 g, 85.4 mmol), was added trifluoroacetic acid anhydride (7.17 g, 34.2 mmol) dropwise and the solution was stirred for half an hour. The reaction solution was neutralized by adding 10% NaOH aqueous solution (18 g), the organic layer was separated and washed with water three times, dried over sodium sulfate, insoluble materials were filtered and the filtrate was condensed to give t-butyl 2-benzyloxycarbonylamino-2-cyanoacetate (1.67 g, yield 67.4%) as a pale yellow oil.

1. customthe organic layer was separated
2. washwashed with water three times
3. dry with materialdried over sodium sulfate, insoluble materials
4. filtrationwere filtered
5. customcondensed