GB835811A - Sulphonylureas - Google Patents

Abstract

Sulphonyl-ureas of the formula RSO2NHCONHR1 in which R and R1 are substituted or unsubstituted alkyl, aryl, alkaryl or aralkyl radicals, are made by reacting a sulphonamide of the general formula RSO2NHM, wherein M is an alkali-metal or one equivalent of an alkaline-earth metal, with a symmetrical urea of the formula R1NHCONHR1, suitably at 75 DEG to 250 DEG C., more preferably at 150 DEG to 170 DEG C. in an inert solvent, and, where the free sulphonyl urea is required, liberating this from the resulting salt by acidification. Suitable starting materials include di- C1-5 alkyl ureas such as di-n-butyl urea and p-toluenesulphonamide or methoxy-, carbethoxy- or halo-phenyl sulphonamides. Specified products include N1-p-toluenesulphonyl -, p - chlorobenzenesulphonyl -, sulphanilyl -, acetylsulphanilyl - and p - nitrobenzenesulphonyl-, N11-butyl urea and N1-p-toluenesulphonyl - N11 - ethyl and N11 - phenyl urea.ALSO:Hypoglycoemic agents comprise sulphonylureas of the formula RSO2NACONHR1, in which R and R1 are substituted or unsubstituted alkyl, aryl, alkaryl or aralkyl radicals (see Group IV (b)). For purposes of assay, a solution of the active material (e.g. N1-n-butyl-N11-p-chloro -, mp - dichloro -, p - methyl -, p-amino and p - nitrobenzenesulphonyl urea; N1 - ethyl -, phenyl - and p - methoxyphenyl-N11 - p - toluenesulphonyl urea; N1 - n - butyl- and N1-phenyl-N11 benzenesulphonyl urea and N1 - isoamyl - N11 - p - nitrobenzenesulphonyl urea) are dissolved in aqueous sodium hydroxide and diluted with Sorensens buffer.