Synthesis, Cytotoxicity, and Antitumor Activity of Copper(II) and Iron(II) Complexes of <sup>4</sup><i>N</i>-Azabicyclo[3.2.2]nonane Thiosemicarbazones Derived from Acyl Diazines
A series of thiosemicarbazones (TSCs) (bearing a (4)N-azabicyclo[3.2.2]nonane moiety) derived from 3-acylpyridazines, 4-acetylpyrimidines, and 2-acetylpyrazines (1-8) were synthesized as potentialantitumoragents. TSCs 1-8 exhibited potent cytotoxic activity against human acute lymphoblastic leukemia CCRF-CEM cells (IC(50) = 0.05-0.77 microM) and colon adenocarcinoma HT-29 cells (IC(50) = 0.011-2