申请人:Lucky Ltd.
公开号:US05405965A1
公开(公告)日:1995-04-11
The present invention relates to a process for preparation of 5-pyrazolemercaptan derivatives represented by the following general formula (I), which is useful for synthesis of sulfonyl-urea-based herbicides, and an intermediate thereof, ##STR1## wherein R.sup.1 represents hydrogen, C.sub.1 -C.sub.4 alkyl, allyl or propargyl, R.sup.2 represents hydrogen, C.sub.1 -C.sub.4 alkyl, or a phenyl group which can contain one or more substituent selected from the group consisting of halogen, nitro and methyl at an optional position, and R.sup.3 represents hydrogen, methyl, ethyl or phenyl.
本发明涉及一种制备5-吡唑硫醇衍生物的方法,该衍生物由以下通用式(I)表示,对于磺酰基脲类除草剂的合成是有用的,以及其中间体,其中R.sup.1代表氢,C.sub.1 -C.sub.4烷基,烯丙基或丙炔基,R.sup.2代表氢,C.sub.1 -C.sub.4烷基,或苯基,该苯基可以在任意位置含有来自卤素、硝基和甲基的一个或多个取代基,R.sup.3代表氢,甲基,乙基或苯基。