| 摘要 |
An improved process for the preparation of 2,6-dichloro-5-fluoronicotinoyl chloride is described where a 2,6-dihydroxy- 5-fluoronicotinic acid ester is converted in one step using phosphorus oxychloride and a lithium reagent to 2,6-dichloro-5-fluor- onicotinoyl chloride and subsequent basic hydrolysis affords 2,6-dichloro-5- fluoronicotinic acid.
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