反应详情

To a solution of ethyl trans-4-[(5-bromo-1,3-thiazol-2-yl) carbonyl]cyclohexane-carboxylate (608 mg, 1.756 mmol) in THF (15 ml) was added trifluoromethyl trimethylsilane (0.520 ml, 3.51 mmol). Then, tetrabutylammonium fluoride (7.0 ml, 7.00 mmol) was added to the mixture slowly. After 1 h, the mixture was diluted with water and extracted with EtOAc. The organic phase was washed with brine, dried over sodium sulfate, filtered and concentrated in vacuo. The residue was purified on silica gel (0-20% EtOAc in hexane) to afford racemic ethyl trans-4-[1-(5-bromo-1,3-thiazol-2-yl)-2,2,2-trifluoro-1-hydroxyethyl]cyclohexanecarboxylate. MS ESI calc'd. for C14H17BrF3NO3S [M+H]+ 416, 418. found 416, 418. 1H NMR (500 MHz, CDCl3) δ 7.68 (s, 1H), 4.11 (q, J=7.1, 2H), 2.47-2.32 (m, 1H), 2.28-1.92 (m, 4H), 1.55-1.16 (m, 5H), 0.90 (t, J=7.3, 3H).

1. extractionextracted with EtOAc
2. washThe organic phase was washed with brine
3. dry with materialdried over sodium sulfate
4. filtrationfiltered
5. concentrationconcentrated in vacuo
6. customThe residue was purified on silica gel (0-20% EtOAc in hexane)