反应详情

5-bromonicotinonitrile (8.8 g, 48.08 mmol), 2-(4-boronophenyl)-2-methylpropanoic acid (example 21b) (11.50 g, 52.89 mmol) and K2CO3 (13.3 g, 96.16 mmol were dissolved in a mixture of DME (120 mL) and water (30 mL). The mixture was degassed for 30 minutes and Pd(PPh3)4 (2.7 g, 2.40 mmol) was added. The reaction mixture was heated to reflux for 16 hr then cooled to room temperature, and evaporated under reduced pressure. The residue was diluted with aq. 0.5 N NaOH (100 mL) and stirred for about 30 min., and then the mixture was extracted with ether (30 mL×3) The aqueous layer was cooled to 0° C., acidified with 2 N HCl, and then extracted with EtOAc. The combined organic layers were washed successively with water and brine, dried over MgSO4, filtered and evaporated. The residue was triturated with hexane, filtered and dried to give 9.4 g of 2-(4-(5-cyanopyridin-3-yl)phenyl)-2-methylpropanoic acid as a white solid in 73% yield.

1. customThe mixture was degassed for 30 minutes
2. temperatureThe reaction mixture was heated
3. temperatureto reflux for 16 hr
4. customevaporated under reduced pressure
5. additionThe residue was diluted with aq. 0.5 N NaOH (100 mL)
6. extractionthe mixture was extracted with ether (30 mL×3) The aqueous layer
7. temperaturewas cooled to 0° C.
8. extractionextracted with EtOAc
9. washThe combined organic layers were washed successively with water and brine
10. dry with materialdried over MgSO4
11. filtrationfiltered
12. customevaporated
13. customThe residue was triturated with hexane
14. filtrationfiltered
15. customdried