申请人:Ciba-Geigy Corporation
公开号:US04076938A1
公开(公告)日:1978-02-28
Process for the production of 3-hydroxy-1,2,4-triazole derivatives of the formula I ##STR1## wherein R.sub.1 represents an alkyl or cycloalkyl group, R.sub.2 denotes an alkyl, cycloalkyl, alkenyl, alkynyl or an optionally substituted benzyl group and X stands for oxygen, sulphur or a group <N--R.sub.3, wherein R.sub.3 denotes an alkyl, alkenyl or alkynyl group, or together with radical R.sub.2 and the adjacent nitrogen atom it denotes a pyrrolidino or morpholino group, wherein a 2-R.sub.1 -hydrazinecarboxylic acid ester is reacted with cyanogen chloride to form the corresponding 2-R.sub.1 -2-cyanohydrazinecarboxylic acid ester which is subsequently cyclized under alkaline conditions in the presence of a compound R.sub.2 XH.
制备式I的3-羟基-1,2,4-三唑衍生物的方法如下:其中R.sub.1代表烷基或环烷基,R.sub.2代表烷基、环烷基、烯基、炔基或可选择取代的苄基,X代表氧、硫或<N--R.sub.3基团,其中R.sub.3代表烷基、烯基或炔基,或者与基团R.sub.2和相邻的氮原子一起表示吡咯烷基或吗啉基,其中2-R.sub.1-肼基羧酸酯与氯氰反应生成相应的2-R.sub.1-2-氰基肼基羧酸酯,然后在碱性条件下在化合物R.sub.2 XH存在下环化。