Paullones 3 and 4 with aminoalkyl side chains in 2- or 3-position were synthesized as derivatives of kenpaullone 1. Both 3 and 4 showed the characteristic CDK1-inhibitory activity of the paullones and a modest antiproliferative activity on cultured human tumor cell lines. Hence, 3 and 4 appear to be suitable tools for affinity studies directed to find additional intracellular paullone targets.
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Wieking et al. (2002) studied this question.