Methanol → (R)-4-(phenylthio)-3-(4-sulfamoyl-2-(trifluoromethylsulfonyl)phenylamino)butanoic acid

A 100 ml flask was charged with (R)-methyl 4-(phenylthio)-3-(4-sulfamoyl-2-(trifluoromethylsulfonyl)phenylamino)butanoate (INTERMEDIATE 7, 7.5 g, 14.63 mmol) and THF (117 ml), MeOH (39 ml) and water (39 ml) were added sequentially. LiOH (1.05 g, 43.9 mmol) was added to the solution and the reaction mixture was stirred at room temperature for 3 hours. The reaction mixture was concentrated under reduced pressure to remove the volatiles, and cooled to 0° C. An aqueous solution of HCl (1N) was added dropwise to the solution and the resulting mixture was filtered. The filter cake was dried under high vacuum at 60° C. to provide the title product (6.8 g, yield: 93%).

1. additionwere added sequentially
2. concentrationThe reaction mixture was concentrated under reduced pressure
3. customto remove the volatiles
4. temperaturecooled to 0° C
5. additionAn aqueous solution of HCl (1N) was added dropwise to the solution
6. filtrationthe resulting mixture was filtered
7. customThe filter cake was dried under high vacuum at 60° C.

ORD record

ord-6209505363a6449b9c97925b3154d81a

Source dataset

uspto-grants-2016_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09248140B2