反应详情

3,5-Dimethyl-4-isothiazolecarboxylic acid is converted to the methyl ester and the ester is reduced with lithium aluminium hydride in tetrahydrofuran to give 4-hydroxymethyl-3,5-dimethylisothiazole. Treating this hydroxymethyl compound with thionyl bromide gives 4-bromomethyl-3,5-dimethylisothiazole which is used as the starting material in the procedure of Example 121 to give N-cyano-N'-methyl-N"-[2-((3,5-dimethyl-4-isothiazolyl)-methylthio)ethyl]guanidine.