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十二种4-取代的2-硝基-(二烴胺基乙酰)苯胺(Ⅰ_(a-1))在稀醋酸中以次硫酸鈉处理,一步“还原环化”成相应的5-取代的2-二煙胺甲基苯并咪唑(Ⅱ_(a-1))。
Twelve 4-substituted 2-nitro- (dihydrocarbanilinoacetyl) anilines (I_ (a-1)) are treated with sodium hyposulphate in dilute acetic acid and one-step “reductive cyclization” to the corresponding 5-substituted Of 2-diaminobenzamidomethyl benzimidazole (II_ (a-1)).