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。