反应详情

(S)-methyl-4-(4-((2-((tert-butoxycarbonyl)amino)-4-methylpentyl)oxy)-2-fluorophenyl)nicotinate (50.0 mg, 0.112 mmol) was taken in a mixture of tetrahydrofuran (1 mL), methanol (1 mL) and water (1 mL). To the solution was added lithium hydroxide (8.05 mg, 0.336 mmol) and the reaction mixture was stirred at RT for 2 h. The reaction mixture was concentrated under reduced pressure and the residue was diluted with water and the pH adjusted to 4 using 1.5N aqueous HCl. The crude product from the aqueous layer was extracted with ethyl acetate (3×5 mL). The combined organic layers were washed with brine (1×5 mL), dried (Na2SO4) and concentrated under reduced pressure to afford (S)-4-(4-((2-((tert-butoxycarbonyl)amino)-4-methylpentyl)oxy)-2-fluorophenyl)nicotinic acid (30 mg, 0.060 mmol, 53% yield) as an off-white solid. LC/MS (ESI) m/e 433.2 [(M+H)+, calcd for C23H30FN2O5 433.2]; LC/MS retention time (method C): tR=1.74 min.

1. concentrationThe reaction mixture was concentrated under reduced pressure
2. additionthe residue was diluted with water
3. extractionThe crude product from the aqueous layer was extracted with ethyl acetate (3×5 mL)
4. washThe combined organic layers were washed with brine (1×5 mL)
5. dry with materialdried (Na2SO4)
6. concentrationconcentrated under reduced pressure