A series of novel small molecules with a 1,2,4-triazine scaffold was obtained according to a recently published and highly efficient synthetic route. Screening for antiproliferative and cytotoxic activity revealed distinct anticancer effects against the human leukemia cell line K-562 combined with a remarkable low cytotoxicity. All compounds were in agreement with the 'rule-of-five' claims by Lipinski and calculated logP(calc) values were experimentally confirmed (logP(exp)). For the most active compounds, in vitro serum albumin binding was investigated and structure-activity relationships were established.