反应详情

To a solution of methyl 5-[methoxy(methyl)amino]-2,2-dimethyl-5-oxopentanoate from Step C (4.68 g, 21.6 mmol) in THF (46.8 mL), cooled to 0° C., was added 3,5-difluorophenyl magnesium bromide (65 mL, 0.5 M in THF, 32.3 mmol) over 30 minutes. The reaction was allowed to stir at ambient temperature for 2 h, after which time no additional reaction progress was observed. Additional 3,5-difluorophenyl magnesium bromide (50 mL, 0.5 M in THF, 25.0 mmol) was added over 30 minutes. After 3 h at 0° C., the reaction was quenched by the rapid addition of a cold (0° C.) solution of EtOH (71 mL) and cone. HCl (5.0 mL). The reaction was then diluted with water (200 mL) and diethyl ether (400 mL). The organics were washed with water (200 mL×3) and brine (100 mL), then dried over sodium sulfate, filtered, and concentrated in vacuo to give a residue. This residue was purified by silica gel chromatography, eluting with a gradient of CH2Cl2:hexanes—50:50 to 100:0, to give the title compound. MS: m/z=239 (M−31(MeO−)).

1. waitAfter 3 h at 0° C.
2. customthe reaction was quenched by the rapid addition of a cold (0° C.) solution of EtOH (71 mL) and cone
3. additionThe reaction was then diluted with water (200 mL) and diethyl ether (400 mL)
4. washThe organics were washed with water (200 mL×3) and brine (100 mL)
5. dry with materialdried over sodium sulfate
6. filtrationfiltered
7. concentrationconcentrated in vacuo
8. customto give a residue
9. customThis residue was purified by silica gel chromatography
10. washeluting with a gradient of CH2Cl2