申请人:BIOGAL GYOGYSZERGYAR
公开号:EP0219990A1
公开(公告)日:1987-04-29
3-Chloro-5-isoxazoleacetic acid is prepared from 3-chloro-5-isoxazolepropionic acid by conversion of the latter to E-3-chloro-5-isoxazoleacrylic acid. This is first converted to the acid chloride, then to the acid azide, which is subjected to a Curtius degradation and hydrolysed and the hydrolysed product is condensed with hydroxylamine to give the corresponding nitrile, which is hydrolysed to give said 3-chioro-5-isoxazoleacetic acid.
3-Cloro-5-isoxazoleacetic acid 是由 3-Cloro-5-isoxazolepropionic acid 制成的,方法是将后者转化为 E-3-Cloro-5-isoxazoleacrylic acid。首先转化为酰氯,然后转化为叠氮酸,叠氮酸经过 Curtius 降解和水解,水解产物与羟胺缩合得到相应的腈,腈经过水解得到所述的 3-氯-5-异恶唑乙酸。