Tetrabutylammonium Fluoride → 8-bromo-2-chloro-4-fluoro-10H-chromeno[3,2-b]pyridin-10-one
反応式
[Br:1][C:2]1[CH:15]=[CH:14][C:13]2[O:12][C:11]3[C:6](=[N:7][C:8]([Cl:19])=[CH:9][C:10]=3[N+]([O-])=O)[C:5](=[O:20])[C:4]=2[CH:3]=1.[F-:21].C([N+](CCCC)(CCCC)CCCC)CCC>CN(C=O)C>[Br:1][C:2]1[CH:15]=[CH:14][C:13]2[O:12][C:11]3[C:6](=[N:7][C:8]([Cl:19])=[CH:9][C:10]=3[F:21])[C:5](=[O:20])[C:4]=2[CH:3]=1参加物
4
実験手順
To a solution of 8-bromo-2-chloro-4-nitro-10H-chromeno[3,2-b]pyridin-10-one (80 mg, 0.225 mmol) in 0.8 mL of DMF at 0° C. was added tetrabutylammonium fluoride (1M in THF, 0.45 mL, 0.450 mmol) dropwise. After 15 minutes, the reaction was quenched with saturated NH4Cl (20 mL) and extracted with ethyl acetate (2×10 mL). The combined organics were dried over sodium sulfate, filtered and evaporated to dryness. Purification of the crude residue by column chromatography (SiO2, CH2Cl2 to CH2Cl2/EA=100:3) gave 8-bromo-2-chloro-4-fluoro-10H-chromeno[3,2-b]pyridin-10-one as an off white solid.