申请人:DowElanco
公开号:US05410065A1
公开(公告)日:1995-04-25
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
1,2,4-三唑并[1,5-a]
嘧啶-2-磺酰胺
除草剂的有用中间体,可从5-
氨基-
3-巯基-1,2,4-三唑经过顺序酰化到5-酰胺基-
3-巯基-1,2,4-三唑,
氯化到5-酰胺基-3-
氯磺酰基-
1,2,4-三唑,然后与取代
苯胺缩合到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中的关键中间体。