a) KMnO4, 25% NaOH, reflux;
b) 25% NH4OH, 145°C, in welded ampoule;
c) heating with 1-(un)substituted-1H-benzimidazol-2-sulphonic acid at 180°C
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| Scheme 1: Synthesis of bis(benzimidazol-2-yl)amines; Regents
and conditions: a) KMnO4, 25% NaOH, reflux; b) 25% NH4OH, 145°C, in welded ampoule; c) heating with 1-(un)substituted-1H-benzimidazol-2-sulphonic acid at 180°C |
