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 ...