2-Aminopyridine → 1-Cyclohexyl-4-oxo-N-(2-pyridyl)-4,5-dihydroimidazo[1,5-a]-quinoxaline-8-carboxamide

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Reaction Steps

1-Cyclohexyl-4-oxo-4,5-dihydroimidazo[1,5-a]quinoxaline-8-carboxyic acid as synthesized in above Example 103, 405 mg, 2-aminopyridine 184 mg, 1-hydroxybenzotriazole monohydrate 299 mg, 4-dimethylaminopyridine 31 mg, pyridine 8.5 mL and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride 375 mg were mixed and stirred for 23 hours. After distilling the solvent off, ethyl acetate and saturated aqueous sodium hydrogencarbonate solution were added to the residue and stirred. The crystals were recovered by filtration and washed successively with water and ethyl acetate. The crystals were heat-suspended in 20 mL of acetone, recovered by filtration and washed with acetone. Drying the crystals, 213 mg of the title compound was obtained.

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