The synthesis of a series of 1‐aminoalkyl‐2‐benzyl‐nitro‐benzimidazoles is described. Many of the 5‐nitro‐benzimidazoles prepared show strong analgesic activity. 1‐(β‐Diethylamino‐ethyl)‐2‐(p‐ethoxy‐benzyl)‐5‐nitro‐benzimidazole (XXXVIII) is 1000 times as potent as morphine and therefore the most active analgesic known until now.
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Hunger et al. (1960) studied this question.
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