Bromocyclopentane → HCID 131721180, compound

Participants

Reaction Steps

An acetonitrile (10 mL) solution of 2-(2,4-dichloro-5-hydroxyphenyl)-5,6-dihydroimidazo [1,5-a] pyridine-1,3[2H, 7H]-dione (0.50 g, 1.61 mmol), cyclopentylbromide (0.19 mL, 1.77 mmol) and potassium carbonate (0.22 g, 1.61 mmol) was stirred for 2 hours under reflux. A saturated ammonium chloride solution (20 mL) was added to the resulting mixture and the organic layer was separated. The aqueous layer was extracted with diethyl ether (10 mL×2 times), and the organic layer combined was washed with a saturated sodium chloride solution (40 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=1/4-1/2) to obtain a white solid of 2-(5-cyclopentyloxy-2,4-dichlorophenyl)-5,6-dihydroimidazo [1,5-a] pyridine-1,3[2H, 7H]-dione (0.37 g, yield:60.7%).

Provenance & Evidence