反应详情

温度

30 °C

2-Bromopyridine (6.50 g, 40 mmol) was added to isopropyl magnesium chloride (2.0 M solution in tetrahydrofuran, 20 mL, 40 mmol) at room temperature. The mixture was stirred for 10 minutes then warmed to 30° C. and stirred for 105 minutes. The mixture was cooled to −10° C. and a solution of (R)-1-(4-fluorophenyl)-6-((4-(trifluoromethyl)phenyl)sulfonyl)-4,4a,5,6,7,8-hexahydro-1H-pyrazolo[3,4-g]isoquinoline-4a-carbaldehyde (5.5 g, 10 mmol) in tetrahydrofuran (9 mL) was added dropwise. The reaction mixture was stirred for 15 minutes at −10° C. followed by stirring at room temperature for 1 hour. The reaction mixture was cooled and treated with water (20 mL) followed by aqueous hydrochloric acid (1.0 M, 40 mL). The mixture was stirred for 10 minutes then extracted with dichloromethane (×2) and the combined organic phases dried over sodium sulfate. The solids were removed by filtration, the filtrate was concentrated under reduced pressure and the residue purified by column chromatography on silica gel (gradient: 20-80% ethyl acetate in cyclohexane) to afford the diastereoisomeric (2:1) mixture (R)-(1-(4-fluorophenyl)-6-((4-(trifluoromethyl)phenyl)sulfonyl)-4,4a,5,6,7,8-hexahydro-1H-pyrazolo[3,4-g]isoquinolin-4a-yl)(pyridin-2-yl)-(R/S)-methanol as an off-white foam (3.25 g). 1H NMR (400 MHz, CDCl3): δ 8.29 (d, J=4.8 Hz, 1 H); 8.00 (d, J=8.2 Hz, 2 H); 7.84-7.86 (m, 3 H); 7.44-7.46 (m, 1 H); 7.29-7.30 (m, 1.5 H); 7.09-7.10 (m, 3.5 H); 6.95-6.97 (m, 2.5 H); 6.41 (s, 0.5 H); 6.18 (s, 1 H); 5.11 (s, 0.5 H); 5.04 (s, 1 H); 4.87 (s, 1 H); 4.50 (d, J=11.8 Hz, 1 H); 4.10 (d, J=13.3 Hz, 2.5 H); 3.80 (d, J=12.1 Hz, 0.5 H); 3.69 (s, 0.5 H); 3.24 (d, J=16.6 Hz, 1 H); 3.09-3.13 (m, 1.5 H); 2.54-2.58 (m, 2.5 H); 2.25-2.27 (m, 1 H); 2.11 (d, J=16.6 Hz, 1 H); 1.43 (s, 0.5 H).

1. stirringstirred for 105 minutes
2. temperatureThe mixture was cooled to −10° C.
3. stirringThe reaction mixture was stirred for 15 minutes at −10° C.
4. stirringby stirring at room temperature for 1 hour
5. temperatureThe reaction mixture was cooled
6. stirringThe mixture was stirred for 10 minutes
7. extractionthen extracted with dichloromethane (×2)
8. dry with materialthe combined organic phases dried over sodium sulfate
9. customThe solids were removed by filtration
10. concentrationthe filtrate was concentrated under reduced pressure
11. customthe residue purified by column chromatography on silica gel (gradient: 20-80% ethyl acetate in cyclohexane)