反应详情

To methyl 3-cyano-4-{[(trifluoromethyl)sulfonyl]oxy}benzoate (D19) (1.5 g, 4.85 mmol) was added bromo(2-methylpropyl)zinc (48.5 ml, 24.25 mmol) in tetrahydrofuran (50 ml) under argon. To the solution was then added 1,1′-bis(diphenylphosphino)ferrocenedichloro palladium(II) dichloromethane complex (0.355 g, 0.485 mmol) and the reaction heated to reflux for 6 h. The mixture was quenched with water (2 mL) and then filtered through celite, washing with ethyl acetate. The solvent was removed in vacuo. The residue was partitioned between ethyl acetate (50 mL) and water (50 mL) and the organic phase dried (phase separator) and the solvent removed in vacuo. The residue was purified by silica chromatography, eluting 0-15% EtOAc in iso-hexane over 40 min. Two batches were collected, one of which was the title compound as a colourless oil (233 mg, 1.072 mmol). δH (CDCl3, 400 MHz): 8.28 (1H, d), 8.15 (1H, dd), 7.38 (1H, d), 3.94, 3H, s), 2.78 (2H, d), 2.02 (1H, m), 0.96 (6H, d).

1. temperatureadded 1,1′-bis(diphenylphosphino)ferrocenedichloro palladium(II) dichloromethane complex (0.355 g, 0.485 mmol) and the reaction heated
2. temperatureto reflux for 6 h
3. customThe mixture was quenched with water (2 mL)
4. filtrationfiltered through celite
5. washwashing with ethyl acetate
6. customThe solvent was removed in vacuo
7. customThe residue was partitioned between ethyl acetate (50 mL) and water (50 mL)
8. customthe organic phase dried (phase separator)
9. customthe solvent removed in vacuo
10. customThe residue was purified by silica chromatography
11. washeluting 0-15% EtOAc in iso-hexane over 40 min
12. customTwo batches were collected