Background: In this investigation, 2-cyano-N-(2,4-dioxo-1,2,3,4-tetrahydropyrimidin-5-yl) acetamide
(3) reacts with dimethylformamide dimethyl acetal (DMF-DMA) to afford the corresponding (E)-
2-cyano-3-(dimethylamino)-N-(2,4-dioxo-1,2,3,4-tetrahydropyrimidin-5-yl)acrylam-ide (4) utilizing microwave
irradiation. The condensation reactions of acrylamide derivative 4 with hydrazine derivatives obtain
pyrazole derivatives 6a and 6b; respectively. The synthesized compounds demonstrate in vitro antitumor
activity against liver tumor cell line HepG2. Furthermore, additional studies were carried out on the
most effective compound 6b to evaluate the potential interaction against 4hdq synthase complex with ΔE=
-4.5Kcal/mol and with short distance = 1.727Å and 2.027Å, respectively. The comprehensive theoretical
studies of compounds 6a and 6b is based on bond length, bond angles and energy gap HOMO-LUMO. In
addition, the vibrational frequencies of optimized compounds 6a and 6b were examined through
DFT/B3LYP/6+31G(d) basis set.
Methods: In this research, synthesis of novel pyrimidiopyrazole derivatives calculated the computational
studies to find suitable drug-receptor interactions and biological activity.
Results and Discussion: The synthesized pyrimidiopyrazole derivative 6b exhibited high antitumor activity
IC50 =12.6 μg/ml and interacted it with 4hdq synthase complex with ΔE=-4.5Kcal/mol and with short distance
= 1.727Å and 2.027Å. Furthermore, the optimized compounds utilize Gaussian 09W.
Conclusion: In the optimized pyrimidiopyrazole derivatives, 6b showed better antitumor activity HeG-2 against
5-flurouracil due to its energy and confirmed more potent of hydrogen bond interaction with protein pocket.