| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for efficiently recovering high purity 5-nitroisoquinoline useful for a pharmaceutical raw material from a mixture of 5-nitroisoquinoline and 8-nitroisoquinoline obtained by nitration of isoquinoline. SOLUTION: High purity 5-nitroisoquinoline is obtained by causing a reaction of a mixture of 5-nitroisoquinoline and 8-nitroisoquinoline with nitric acid in water solvent to produce nitric acid salts, separating only the 5-nitroisoquinoline nitric acid salt in form of a crystal by precipitation, and neutralizing the crystal by an alkali. COPYRIGHT: (C)2004,JPO&NCIPI
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