反应详情

3.40 g 2-chloro-5,6-dimethoxy benzimidazole, 7.50 g piperazine N-carboxylic acid isobutyl ester (described in U.S. 3,635,979, Example LVII) and 25 ml 2-methoxyethanol were reacted as in Example I to give the base of the desired product as a gum. This was washed free of starting amine with water, then dissolved in isopropyl alcohol and acidified with HCl gas to give 5.30 g product HCl salt, mp 248°-250° C