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C - Chemistry, Metallurgy

07

D

C07D 487/04 (2006.01)

Patent

CA 2037004

ABSTRACT 5,7-Dihydroxy-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 malonyl halides under acidic conditions. With the addition of a phosphorus oxyhalide, malonic acid can be used in place of the malonyl halides and the 5,7-dihydroxy-1,2,4- -triazolo[1,5-a]pyrimidine can be directly converted to the corresponding 5,7-dihalo derivative.

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