Pyrrolo[2,3-a]carbazole-3-carbaldehydes are potent Pim kinase inhibitors with in vitro antiproliferative activities. In the present study, we report the synthesis and biological activities (Pim kinase inhibition and in vitro antiproliferative potency) of new 4-substituted pyrrolo[2,3-a]carbazoles. The results demonstrated that the Pim kinase inhibitory potency (especially Pim-3) can be conserved for pyrrolo[2,3-a]carbazoles bearing a methoxycarbonyl group at the 4-position without a formyl at the 3-position. Moreover, compound 27 that was found to be active against Pim-1 and Pim-3 kinases showed antiproliferative activities in the micromolar range.
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