申请人:DowElanco
公开号:EP0375061A1
公开(公告)日:1990-06-27
A process for preparing 5-amino-1,2,4-triazole-3-sulfonamides, which are intermediates for substituted 1,2,4-triazolo[1,5-a]-pyrimidine-2-sulfonamide herbicides, in two steps from 5-amino-3-mercapto-1,2,4-triazole by chlorination in a medium containing an aqueous acid to obtain 5-amino-3-chlorosulfonyl-1,2,4-triazole and subsequent condensation of this intermediate with substituted anilines is disclosed. The condensation reaction takes place either in the presence or absence of an acid scavenging base. Novel intermediates are also provided.
本发明公开了一种分两步制备 5-氨基-1,2,4-三唑-3-磺酰胺(取代的 1,2,4-三唑并[1,5-a]-嘧啶-2-磺酰胺除草剂的中间体)的工艺,该工艺以 5-氨基-3-巯基-1,2,4-三唑为原料,在含有水性酸的介质中进行氯化反应,得到 5-氨基-3-氯磺酰基-1,2,4-三唑,然后将该中间体与取代的苯胺进行缩合反应。缩合反应在有或没有酸清除碱的情况下进行。还提供了新型中间体。