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This study identified the isoindolone ring as a scaffold for novel agents against  Trypanosoma brucei rhodesiense  and explored the structure‐activity relationships of various aromatic ring substitutions. The compounds were evaluated in an integrated in vitro screen. Eight compounds exhibited selective activity against  T. b. rhodesiense  (IC 50 <2.2 μ m ) with no detectable side activity against  T. cruzi  and  Leishmania infantum . Compound  20  showed low nanomolar potency against  T. b. rhodesiense  (IC 50 =40 n m ) and no toxicity against MRC‐5 and PMM cell lines and may be regarded as a new lead template for agents against  T. b. rhodesiense . The isoindolone‐based compounds have the potential to progress into lead optimization in view of their highly selective in vitro potency, absence of cytotoxicity and acceptable metabolic stability. However, the solubility of the compounds represents a limiting factor that should be addressed to improve the physicochemical properties that are required to proceed further in the development of in vivo‐active derivatives.

Development of Novel Isoindolone‐Based Compounds against Trypanosoma brucei rhodesiense