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Pyrazole-Cyclotriphosphazene Hybrids: Synthesis, Structural Insights, and Cytotoxic Effects against Pancreatic Cancer
Ceylan Mutlu Balcı1, Basak Dalbayrak2, Esma Mutlu1
1Department of Chemistry, Faculty of Basic Sciences, Gebze Technical University, Gebze 41400, Kocaeli, Turkey.
ACS Omega
|April 27, 2026
Summary
Researchers synthesized novel inorganic-organic hybrid molecules, specifically cyclotriphosphazene derivatives, to combat pancreatic cancer. Compound 3a demonstrated significant anticancer activity against pancreatic cancer cell lines PANC-1 and MIA PaCa-2, offering a promising new therapeutic avenue.
Area of Science:
- Medicinal Chemistry
- Organic Synthesis
- Cancer Research
Background:
- Pancreatic cancer has a very low long-term survival rate, necessitating the development of new treatments.
- Pyrazole scaffolds are known for their biological activity, making them attractive for drug development.
- Hexachlorocyclotriphosphazene (HCCTP) serves as a versatile inorganic core for creating hybrid molecules.
Purpose of the Study:
- To synthesize novel inorganic-organic hybrid molecules based on pyrazole-substituted cyclotriphosphazenes.
- To investigate the anticancer properties of these synthesized compounds against pancreatic cancer cell lines.
- To explore the structure-activity relationship of different substitution patterns on the cyclotriphosphazene core.
Main Methods:
- Nucleophilic substitution reactions between 4-chloro-2-(1H-pyrazol-3-yl)-phenol and HCCTP using different bases (NaH, Et3N).
- Structural elucidation of synthesized compounds using spectroscopic techniques (NMR, Mass Spectrometry) and X-ray diffraction.
- In vitro evaluation of anticancer activity against PANC-1 and MIA PaCa-2 cell lines.
Main Results:
- Successfully synthesized various cyclotriphosphazene derivatives with monospiro, dispiro, and trispiro substitution patterns.
- Compound 3a (monospiro derivative) exhibited potent in vitro anticancer activity against both PANC-1 (IC50 = 24.57 μg/mL) and MIA PaCa-2 (IC50 = 23.30 μg/mL) cell lines.
- The study provides the first investigation into the biological properties of these specific pyrazole-substituted cyclotriphosphazene compounds in pancreatic cancer models.
Conclusions:
- Novel pyrazole-containing cyclotriphosphazene hybrids were synthesized and characterized.
- Compound 3a shows significant promise as a potential therapeutic agent for pancreatic cancer.
- Further research into these hybrid molecules could lead to the development of more effective pancreatic cancer treatments.
