A series of novel compounds 7–43 were prepared via the condensation of enaminones 4a–h and the guanidines carbonate 6a–f. The structures of these newly synthesized compounds were confirmed by 1H‐NMR, MS, EA and IR. All the compounds were tested for their cytotoxic activity in vitro against human cancer cell lines including Ishikawa, A549, BEL‐7404, SPC‐A‐01 and SGC‐7901. Most of them showed moderate