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.
生产式I的3-羟基-1,2,4-三唑衍生物的过程,其中R1代表烷基或环烷基,R2表示烷基、环烷基、烯基、炔基或可选取代苄基,X代表氧、硫或<N--R3的基团,其中R3代表烷基、烯基或炔基,或与基团R2和相邻的氮原子一起表示吡咯啉基或吗啉基,在存在化合物R2XH的条件下,2-R1-肼基甲酸酯与氰化氯反应,形成相应的2-R1-2-氰基肼基甲酸酯,随后在碱性条件下环化。