Hydrochloric Acid → HCID 131721181, compound

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Reaction Steps

To a pyridine (5 mL) solution of 2-(5-amino-4-chloro-2-fluorophenyl)-5,6-dihydroimidazo [1,5-a] pyridine-1, 3[2H, 7H]-dione (0.35 g, 1.2 mmol) was dropwise added p-toluenesulfonyl chloride (0.25 g, 1.3 mmol) under cooling in an ice-water bath, and the mixture was stirred for 2.5 hours at the ambient temperature. 1N Hydrochloric acid (60 mL) and ethyl acetate (40 mL) were added to the resulting mixture and the organic layer was separated. The aqueous layer was extracted with ethyl acetate (20 mL×2 times), and the organic layer combined was washed with a saturated sodium chloride solution (100 mL) and dried over anhydrous magnesium sulfate. After removal of magnesium sulfate by filtration, the filtrate was evaporated to give crude product, which was purified by silica gel column (Wakogel C-200, ethyl acetate/hexane =1/2) to obtain a white solid of 2-[4-chloro-2-fluoro-5-(p-toluenesulfonylamino)phenyl]-5,6-dihydroimidazo [1,5-a] pyridine-1,3[2H, 7H]-dione (0.32 g, yield:59.3%).

Provenance & Evidence