反应详情

To (3S,4S)-tert-butyl 4-(3-fluoro-4-hydroxyphenyl)-3-hydroxypiperidine-1-carboxylate (2.99 g, 9.60 mmol) in DCM (75 mL) at 0° C. was added DAST (6.34 mL, 48.0 mmol) dropwise. The reaction was then allowed to warm to room temperature and stir for 2 h. The reaction was slowly quenched with ice water. The reaction was then extracted with dichloromethane, washed with additional water, dried with magnesium sulfate, filtered and concentrated in vacuo to afford (3S,4S)-tert-butyl 3-fluoro-4-(3-fluoro-4-hydroxyphenyl)piperidine-1-carboxylate (3.88 g, quantitative yield) as a yellow viscous oil: LC-MS [M−H]+ 312.2; 1H NMR (500 MHz, DMSO-d6) δ 7.22-7.10 (m, 1H), 7.00-6.76 (m, 3H), 5.76 (s, 2H), 4.60 (td, J=10.1, 5.2 Hz, 1H), 4.50 (td, J=10.1, 5.2 Hz, 1H), 4.27 (br. s., 1H), 4.07-3.78 (m, 2H), 3.66-3.50 (m, 1H), 3.00-2.65 (m, 4H), 1.81-1.69 (m, 1H), 1.63-1.50 (m, 1H), 1.46-1.30 (m, 14H), 1.20-1.01 (m, 2H).

1. customThe reaction was slowly quenched with ice water
2. extractionThe reaction was then extracted with dichloromethane
3. washwashed with additional water
4. dry with materialdried with magnesium sulfate
5. filtrationfiltered
6. concentrationconcentrated in vacuo