[Compounds with antitumor activity. V. Hydrazone derivatives of 5-formylimidazo(2,1-b)thiazoles and 6-substituted 2,3-dihydro-5-formylimidazo(2,1-b)thiazoles].

The synthesis of 2,3-dihydro-5-formylimidazo[2,1-b]thiazoles with different substituents at position 6 (CH3, C6H5, Cl, Br) is reported; thiosemicarbazones and tosylhydrazones were prepared from these aldehydes and from the 2,3-unsaturated analogues: these derivatives, submitted to a preliminary test, did not show significant antileukemic activity.