Calcium acetate monohydrate → n-Ethyl-n-phenyl-5-chloro-1,2-dihydro-4-hydroxy-1-methyl-2-oxo-3-quinolinecarboxamide calcium salt

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Reaction Conditions

Reaction Steps

N-Ethyl-N-phenyl-5-chloro-1,2-dihydro-4-hydroxy-1-methyl-2-oxo-3-quinolinecarboxamide sodium salt (2.63 mmol, 1.0 g) was dissolved in a mixture of ethanol (10.5 ml) and water (5.3 ml). The solution was heated to 70° C. and a solution of calcium acetate hydrate in water (1M solution, 1.05 eq., 1.38 mmol, 1.38 ml) was added. The resulting suspension was stirred for 30 minutes, then cooled, and the crystals were isolated by filtration, washed with water, and dried under vacuum (966 mg, 98% yield). Anal. Calcd for C38H32Cl2N4O6Ca: C, 60.7; H, 4.29; N, 7.45. Found C, 60.5; H, 4.34; N, 7.41.

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