申请人:The Dow Chemical Company
公开号:US04937350A1
公开(公告)日:1990-06-26
N-(3-(((2,6-Dihalophenyl)amino)sulfonyl)-1H-1,2,4-triazol-5-yl)amines, intermediates for the preparation of herbicidal substituted 1,2,4-triazolo(1,5-a)pyrimidine-2-sulfonanilides, are directly prepared from an appropriataely substituted 4-bromoaniline and a protected 5-amino-1,2,4-triazole-3-sulfonyl chloride. The improved reaction scheme involves the individual reaction steps of (a) coupling, (b) halogenation and (c) reduction.
N-(3-(((2,6-二卤代苯基)氨基)磺酰)-1H-1,2,4-三唑-5-基)胺是制备除草剂取代的1,2,4-三唑并(1,5-a)嘧啶-2-磺酰苯胺的中间体,可直接从适当取代的4-溴苯胺和保护的5-氨基-1,2,4-三唑-3-磺酰氯中制备。改进的反应方案包括(a)偶联、(b)卤代和(c)还原的单独反应步骤。