反应详情

温度

45 °C

Potassium hydroxide (0.396 g, 7.05 mmol) was added in one portion to methyl 2-(4′-(6-carbamoyl-3,5-dimethylpyrazin-2-yl)-2,6-difluorobiphenyl-4-yl)propanoate (Intermediate 21-1; 1 g, 2.35 mmol) in t-BuOH (15.16 mL) at room temperature. The resulting solution was stirred at 45° C. for 5 hours, a precipitate formed. The reaction mixture was quenched with 2M HCl (5 mL), evaporated to dryness and redissolved in water (10 mL), filtered through nylon, washed with water and dried under vacuum to afford product as a white solid. The product was purified by preparative HPLC (Waters XBridge Prep C18 OBD column, 5μ silica, 50 mm diameter, 150 mm length), using decreasingly polar mixtures of water (containing 0.1% formic acid) and MeCN/MeOH as eluents. Fractions containing the desired compound were evaporated to dryness to afford 2-(4′-(6-carbamoyl-3,5-dimethylpyrazin-2-yl)-2,6-difluorobiphenyl-4-yl)propanoic acid (0.530 g, 54.8%) as a white powder.

1. customa precipitate formed
2. customThe reaction mixture was quenched with 2M HCl (5 mL)
3. customevaporated to dryness
4. dissolutionredissolved in water (10 mL)
5. filtrationfiltered through nylon
6. washwashed with water
7. customdried under vacuum
8. customto afford product as a white solid
9. customThe product was purified by preparative HPLC (Waters XBridge Prep C18 OBD column, 5μ silica, 50 mm diameter, 150 mm length)
10. additionFractions containing the desired compound
11. customwere evaporated to dryness