A new series of 1-N-thiocarboxamide-3-phenyl-2-pyrazolines 1–6 was synthesized by cyclization of different Mannich bases with unsubstituted thiosemicarbazide. The reaction of cyclized pyrazoline derivatives 1–6 with 2, 3-dichloroquinoxaline afforded the title compounds 7–12. The structures of the new compounds were confirmed by elemental analyses as well as 1H, 13C NMR, IR and electronic spectral data. The HM1: IMSS strain ...