申请人:DowElanco
公开号:US05391759A1
公开(公告)日:1995-02-21
5-Acylamino-1,2,4-triazole-3-sulfonamides, which are useful intermediates for the preparation of 1,2,4-triazolo[1,5-a]pyrimidine-2-sulfonamide herbicides are prepared from 5-amino-3-mercapto-1,2,4-triazole by sequential acylation to 5-acylamino-3-mercapto-1,2,4-triazoles, chlorination to 5-acylamino-3-chlorosulfonyl-1,2,4-triazoles, and condensation with substituted anilines to 5-acylamino-1,2,4-triazole-3-sulfonamides. 5-Acylamino-3-chlorosulfonyl-1,2,4-triazole compounds are key intermediates in the process.
5-酰胺基-1,2,4-三唑-3-磺酰胺是制备1,2,4-三唑[1,5-a]嘧啶-2-磺酰胺除草剂的有用中间体。这些中间体通过对5-氨基-3-巯基-1,2,4-三唑进行顺序酰化制备成5-酰胺基-3-巯基-1,2,4-三唑,然后进行氯化制备成5-酰胺基-3-氯磺酰基-1,2,4-三唑,最后与取代苯胺缩合制备成5-酰胺基-1,2,4-三唑-3-磺酰胺。5-酰胺基-3-氯磺酰基-1,2,4-三唑化合物是该过程的关键中间体。