专利号:US-5204478-A 优先权日:1992-08-20 标题 :Process for the synthesis of 2,6-dichloro-5-fluoronicotinic acid and 2,6-dichloro-5-fluoronicotinoyl chloride 发明人:JENNINGS REX A 权利人:WARNER LAMBERT CO 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-fluoronicotinoyl chloride and subsequent basic hydrolysis affords 2,6-dichloro-5-fluoronicotinic acid.
专利号:US-11059788-B2 优先权日:2017-06-12 标 题:Streamlined syntheses of fluoroquinolones 发明人:GUPTON FRANK B; TOSSO PERRER N 权利人:UNIV VIRGINIA COMMONWEALTH 摘要:Methods of synthesizing fluoroquinolones such as ciprofloxacin are provided. The methods utilize affordable materials, reduce the number of synthesis steps and provide high yields.
专利号:EP-0655998-B1 优先权日:1992-08-20 标题:Improved process for the synthesis of 2,6-dichloro-5-fluoronicotinic acid and 2,6-dichloro-5-fluoronicotinoyl chloride
专利号:EP-0655998-A1 优先权日:1992-08-20 标 题 :METHOD FOR THE SYNTHESIS OF 2,6-DICHLOR-5-FLUORNICOTINIC ACID AND 2,6-DICHLOR-5-FLUORNICOTINOYL CHLORIDE.
专利号:WO-9404501-A1 优先权日:1992-08-20 标题 :Improved process for the synthesis of 2,6-dichloro-5-fluoronicotinic acid and 2,6-dichloro-5-fluoronicotinoyl chloride
专利号:CZ-286204-B6 优先权日:1992-08-20 标 题:Improved synthesis of 2,6-dichloro-5-fluoronicotinic acid and 2,6-dichloro-5-fluoronicotinoyl chloride