申请人:DowElanco
公开号:US05359079A1
公开(公告)日:1994-10-25
5-Amino-1,2,4-triazole-3-sulfonamides, which are intermediates for substituted 1,2,4-triazolo[1,5-a]pyrimidine-2-sulfonamide herbicides are prepared 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. The condensation reaction takes place either in the presence or absence of an acid scavenging base.
5-氨基-1,2,4-三唑-3-磺酰胺是取代的1,2,4-三唑[1,5-a]嘧啶-2-磺酰胺除草剂的中间体,通过两步反应从5-氨基-3-巯基-1,2,4-三唑制备而成。首先,在含���水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。缩合反应可以在酸碱中和或不和酸中和的情况下进行。