申请人:Hoechst AG.
公开号:US04246196A1
公开(公告)日:1981-01-20
Diaminophenyl ureas of the formula ##STR1## in which R is an inert substituent, are obtained from the corresponding dinitrophenyl urea by way of reduction, especially catalytic hydrogenation. Through a cyclization process, while splitting off ammonia, these ureas yield the corresponding aminobenzimidazolones, advantageously without an intermediate isolation of the diaminophenyl ureas.
公式为##STR1##的二氨基苯基脲,其中R为惰性取代基,可通过还原相应的二硝基苯基脲得到,特别是催化氢化。通过环化过程,同时分解氨,这些脲可以优点地产生相应的氨基苯并咪唑酮,而不需要中间分离二氨基苯基脲。