Sodium Bicarbonate → HCID 68282650, compound

Temperature

50 °C

(3R,3aR,6R,6aR)-6-((5-(4-bromophenyl)-6-chloro-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-imidazo[4,5-b]pyridin-2-yl)oxy)hexahydrofuro[3,2-b]furan-3-ol (intermediate 7, 527 mg, 0.904 mmol) was placed under nitrogen in formic acid (2.5 mL). A saturated aqueous solution of potassium hydrogen sulfate (0.4 mL) was added and the resulting mixture was allowed to stir at 50° C. for 9 hours. The mixture was cooled and added slowly to saturated aqueous sodium bicarbonate (200 mL). The mixture was extracted with ethyl acetate (2×150 mL) and concentrated under reduced pressure. The resulting white solid was dissolved in methanol (5 mL) and basified with 3N aqueous sodium hydroxide (2 mL). The mixture was stirred at room temperature for 10 minutes, then neutralized with 1N aqueous hydrochloric acid (6 mL). The mixture was poured into saturated aqueous sodium bicarbonate (25 mL) and extracted with ethyl acetate (2×50 mL). The combined organic layers were dried over sodium sulfate and concentrated under reduced pressure. The resulting white solid was chromatographed using a Biotage 25 g silica gel cartridge eluted with 0-5% methanol in dichloromethane over 20 minutes. The product fractions were combined, concentrated under reduced pressure, and dried under high vacuum to obtain a white solid. LC-MS: calculated for C18H15BrClN3O4 452.69 observed m/e: 454.02 (M+H)+ (Rt 1.84/4 min).

1. temperatureThe mixture was cooled
2. extractionThe mixture was extracted with ethyl acetate (2×150 mL)
3. concentrationconcentrated under reduced pressure
4. dissolutionThe resulting white solid was dissolved in methanol (5 mL)
5. stirringThe mixture was stirred at room temperature for 10 minutes
6. additionThe mixture was poured into saturated aqueous sodium bicarbonate (25 mL)
7. extractionextracted with ethyl acetate (2×50 mL)
8. dry with materialThe combined organic layers were dried over sodium sulfate
9. concentrationconcentrated under reduced pressure
10. customThe resulting white solid was chromatographed
11. washeluted with 0-5% methanol in dichloromethane over 20 minutes
12. concentrationconcentrated under reduced pressure
13. customdried under high vacuum
14. customto obtain a white solid
15. custom454.02 (M+H)+ (Rt 1.84/4 min)

ORD record

ord-3d953100a58e44e2b575de9ff1cda673

Source dataset

uspto-grants-2014_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08796258B2