1-amino-5-methoxycarbonyl-2-methylbenzimidazole 、 4-chloro-3-(N-dimethylaminomethylidene)sulfamoylbenzoyl chloride 以
吡啶 、
水 为溶剂,
以23.9 g (90%)的产率得到1-[4'-chloro-3'-(N-dimethylaminomethylidene)sulfamoylbenzoyl]amino-5-methoxycarbonyl-2-methylbenzimidazole