Cl[CH2:2][C:3]1[C:4](=[O:15])[NH:5][C:6]2[C:11]([CH:12]=1)=[CH:10][C:9]([O:13][CH3:14])=[CH:8][CH:7]=2.[C:16]([O-:19])(=[O:18])[CH3:17].[K+]>C(OC(=O)C)(=O)C>[C:16]([O:19][CH2:2][C:3]1[C:4](=[O:15])[NH:5][C:6]2[C:11]([CH:12]=1)=[CH:10][C:9]([O:13][CH3:14])=[CH:8][CH:7]=2)(=[O:18])[CH3:17]2.2 Grams of 3-chloromethyl-6-methoxycarbostyril was dissolved in 20 ml of acetic anhydride, then 12 g of potassium acetate was added thereto and stirred at 60°-70° C. for 3 hours. The reaction mixture was poured in an ice-water and the crystals precipitated were collected by filtration. Recrystallized from acetone to obtain 2 g of 3-acetoxymethyl-6-methoxycarbostyril in the form of colorless prism-like crystals.
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