反应详情

To a solution of 6.6 ml (1 M in THF, 7 mmol) of lithium hexamethyldisilylazide cooled to −78° C. under Ar was added, drop wise, a solution of 2.0 g (6 mmol) of [cyclopropyl-(4-trifluoromethoxy-benzoyl)-amino]-acetic acid ethyl ester in 10 ml of THF. The mixture was stirred for 1 h before 0.7 g of acetic anhydride was added and the mixture was allowed to reach room temperature. After 2 h the reaction was diluted with EtOAc, washed with saturated ammonium chloride solution, the organic phase dried with sodium sulfate and concentrated. Purification by flash column chromatography [n-heptane/EtOAc 1:9 to 3:7] afforded 0.3 g (13%) of the title compound as a colorless oil. MS: 374.2 (MH+).

1. additionwas added
2. additionwas added
3. customto reach room temperature
4. washwashed with saturated ammonium chloride solution
5. dry with materialthe organic phase dried with sodium sulfate
6. concentrationconcentrated
7. customPurification by flash column chromatography [n-heptane/EtOAc 1:9 to 3:7]