2-Substituted paullones: CDK1/cyclin B-inhibiting property and in vitro antiproliferative activity.

9-Trifluoromethyl-paullones with a carbon chain in the 2-position were synthesized by palladium-catalyzed coupling reactions of a 2-iodoprecursor with terminal alkenes or alkynes, respectively. The introduction of a 2-cyanoethyl substituent led to a significant enhancement of CDK1/cyclin B inhibiting property and in vitro antiproliferative activity.