申请人:A.H. ROBINS COMPANY, INCORPORATED
公开号:EP0225172A1
公开(公告)日:1987-06-10
A process for the preparation of 5-halo-2-hydroxynicotinic acids having the formula
wherein X is chlorine or bromine; Y and Z are selected from hydrogen, loweralkyl, loweralkoxy, chlorine, bromine, iodine or fluorine, is described which comprises halogenating the corresponding 2-hydroxynicotinic acid with hypohalous acid in a concentrated halogen acid or with a alkali-metal hypohalite in aqueous or aqueous basic solution.
描述了一种制备 5-卤代-2-羟基烟酸的工艺,其式中 X 是氯或溴,Y 和 Z 选自氢、低级烷基、低级烷氧基、氯、溴、碘或氟,该工艺包括在浓卤酸中用次卤酸或在水溶液或碱性水溶液中用碱金属次卤酸卤化相应的 2-羟基烟酸。