4-(4-Chloro-2-fluorophenyl)nicotinaldehyde → (4-(4-Chloro-2-fluorophenyl)pyridin-3-yl)(cyclopropyl)methanol
反応式
[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[C:13]([CH:14]=[O:15])=[CH:12][N:11]=[CH:10][CH:9]=2)=[C:4]([F:16])[CH:3]=1.[CH:17]1([Mg]Br)[CH2:19][CH2:18]1>C1COCC1>[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[CH:9]=[CH:10][N:11]=[CH:12][C:13]=2[CH:14]([CH:17]2[CH2:19][CH2:18]2)[OH:15])=[C:4]([F:16])[CH:3]=1参加物
4
反応条件
- 温度
- -78 °C
実験手順
To a solution of 4-(4-chloro-2-fluorophenyl)nicotinaldehyde (1.6 g, 6.79 mmol) (prepared as in Example 5, Part B) in THF (32 mL) cooled to −78° C., was added cyclopropylmagnesium bromide (27.2 mL, 13.58 mmol) dropwise over a period of 20 min. The reaction mixture was allowed to stir at −78° C. for 3 h. The dry ice bath was removed and reaction mixture was brought to room temperature. The reaction mixture was quenched by addition of saturated aqueous ammonium chloride solution (30 mL). The reaction mixture was extracted with ethyl acetate (3×50 mL). The combined organic extracts were washed with brine (1×50 mL), dried over sodium sulfate and concentrated under reduced pressure. The crude product was purified by silica gel chromatography (30% ethyl acetate in pet ether) to afford (4-(4-chloro-2-fluorophenyl)pyridin-3-yl)(cyclopropyl)methanol (900 mg, 3.24 mmol, 48% yield). LCMS (ESI) m/e 278.0 [(M+H)+, calcd for C15H14ClFNO 278.1]; LC/MS retention time (Method C): tR=1.62 min.