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温度

0 °C

To an at 0° C. per cooled solution of [(RS)-1-(6-bromo-pyridin-2-yl)-2-((R)-1-carbamoyl-2,2,2-trifluoro-1-methyl-ethoxy)-1-methyl-ethyl]-carbamic acid tert-butyl ester (2.18 g, 4.64 mmol) and NEt3 (1.615 ml, 1.173 g, 11.59 mmol) in DCM (30 ml) was added dropwise TFAA (0.773 ml, 1.168 g, 5.56 mmol). After stirring for 5 min at 0° C., then for 1 h at rt the reaction mixture was diluted with sat. aq. Na2CO3 soln. and with DCM. The phases were separated and the aq. phase was twice reextracted with DCM. The combined org. phases were dried over Na2SO4, filtered and concentrated to leave a pale yellow oil which was stirred with 7N NH3/MeOH for 5 min. The mixture was evaporated to dryness and purified by flash chromatography (cyclohexane: EtOAc 0-3 min 100:0, 3-35 min 65:35) to yield the title compound as a clear oil.

1. customThe phases were separated
2. dry with materialphases were dried over Na2SO4
3. filtrationfiltered
4. concentrationconcentrated
5. customto leave a pale yellow oil which
6. customThe mixture was evaporated to dryness
7. custompurified by flash chromatography (cyclohexane: EtOAc 0-3 min 100:0, 3-35 min 65:35)