发明授权
US4988812A Aqueous process for the preparation of 5-methyl-n-(aryl)-1,2,4-triazolo(1,5-A)pyrimidine-2-sulfonamides 失效
用于制备5-甲基 - 正 - (芳基)-1,2,4-三唑并(1,5-A)嘧啶-2-磺酰胺的水性方法

Aqueous process for the preparation of
5-methyl-n-(aryl)-1,2,4-triazolo(1,5-A)pyrimidine-2-sulfonamides
摘要:
5-Methyl-N-(aryl)-1,2,4-triazolo[1,5-a]-pyrimidine-2-sulfonamides are prepared by the cyclization of N -(3-(((aryl)amino)sulfonyl)-1H-1,2,4-triazol-5-yl)amines with 4-methoxy-3-butene-2-one or its synthetic equivalents in the presence of an aqueous base. By controlling the pH of the condensation between 8.5 and 10.5, by-product formation can be substantially reduced.
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