Dimethylformamide → 4-Cyclopentyl-3-(trifluoromethyl)benzaldehyde

反応式

Br[C:2]1[CH:7]=[CH:6][C:5]([CH:8]2[CH2:12][CH2:11][CH2:10][CH2:9]2)=[C:4]([C:13]([F:16])([F:15])[F:14])[CH:3]=1.[Li]CCCC.CN([CH:25]=[O:26])C>C1COCC1>[CH:8]1([C:5]2[CH:6]=[CH:7][C:2]([CH:25]=[O:26])=[CH:3][C:4]=2[C:13]([F:16])([F:15])[F:14])[CH2:12][CH2:11][CH2:10][CH2:9]1

参加物

実験手順

In a 15 mL round-bottomed flask were placed 4-bromo-1-cyclopentyl-2-(trifluoromethyl)benzene (0.186 g, 0.635 mmol) and anhydrous THF (1.86 mL) under argon atmosphere. The solution was stirred well and cooled to −78° C. (dry ice IPA bath). BuLi (2.5 M in hexanes, 0.281 mL, 0.703 mmol) was added in drops (slowly) and the reaction mixture was stirred at low temperature for 25 min. Anhydrous DMF (0.1 mL, 0.766 mmol) was added in drops at −78° C. (slowly). The mixture was stirred at −78° C. for 20 min then at room temperature for 30 min. The reaction was quenched with water, acidified with 2 M HCl and extracted with EtOAc. The EtOAc layer was washed with water, dried over Na2SO4, and concentrated in vacuo to give the title compound as an oil (60 mg). LCMS m/z=243.3 [M+H]+. 1H NMR (400 MHz, DMSO-d6) δ ppm 1.55-1.7 (m, 4H), 1.79-1.94 (m, 2H), 1.95-2.09 (m, 2H), 3.29-3.37 (m, 1H), 7.86 (d, J=8 Hz, 1H), 8.12 (d, J=8 Hz, 1H), 8.16 (d, J=1.2 Hz, 1H), 10.46 (s, 1H).