n-(4-Fluoro-2-(n,n-dimethylsulfamoyl)benzyl)-6-benzyloxy-1-isopropyl-5-oxo-1,2,3,5-tetrahydroimidazo[1,2-a]pyrimidine-7-carboxamide → n-(4-Fluoro-2-(n,n-dimethylsulfamoyl)benzyl)-6-hydroxy-1-isopropyl-5-oxo-1,2,3,5-tetrahydroimidazo[1,2-a]pyrimidine-7-carboxamide

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A solution of N-(4-fluoro-2-(N,N-dimethylsulfamoyl)benzyl)-6-benzyloxy-1-isopropyl-5-oxo-1,2,3,5-tetrahydroimidazo[1,2-a]pyrimidine-7-carboxamide (0.155 g, 0.28 mmol) in trifluoroacetic acid (10 ml) was stirred at 25° C. for 72 h. The solvent was then evaporated under reduced pressure and the residue was purified by preparative HPLC (column YMC Pack C-18, 5μ, 20×250 mm, elution gradient acetonitrile-water 0.1% trifluoroacetic acid) to give 0.105 g (81% yield) of the title amide as a white solid.

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