Abstract
Ethyl 4-hydroxy-7-(trifluoromethyl)quinoline-3-carboxylate (1) exhibits a moderate cytotoxic activity against the MCF-7 mammary gland cancer cell line and HePG2 hepatocellular carcinoma cell line and a weak activity against the HCT-116 human colorectal carcinoma cell line. In order to enhance the cytotoxic activity of this compound, it was modified by changing the side-chain substituent and/or forming a new heterocyclic ring fused to the pyridine ring. Heating compound 1 with chloroacetyl chloride gave a mixture of two isomeric O-acylation products ethyl 4-(2-chloroacetoxy)-7-(trifluoromethyl)-quinoline-3-carboxylate and 3-chloro-8-(trifluoromethyl)-2H-pyrano[3,2-c]quinoline-2,4(3H)-dione, whereas the reaction with acetyl chloride in NaOH formed an N-acylation product 1-acetyl-4-oxo-7-(trifluoromethyl)-1,4-dihydroquinoline-3-carboxylic acid. The reactions of compound 1 with urea, thiourea, hydrazine hydrate, hydroxylamine, o-phenylenediamine, phenyl isothiocyanate, and ethyl acetoacetate yielded the corresponding condensation products 1-[4-oxo-7-(trifluoromethyl)-3,4-dihydroquinoline-3-carbonyl)]urea, 1-[4-oxo-7-(trifluoromethyl)-3,4-dihydroquinoline-3-carbonyl)]thiourea, 7-(trifluoromethyl)-1,2-dihydropyrazolo[4,3-c]quinolin-3-one, 7-(trifluoromethyl)isoxazolo[4,5-c]quinolin-3(2H)-one, 3-(trifluoromethyl)-13H-benzo[2,3][1,4]diazepino[6,5-c]quinolin-7-ol, 3-phenyl-2-thioxo-8-(trifluoromethyl)-2,3-dihydro-4H-[1,3]oxazino[5,6-c]quinolin-4-one and ethyl 8-(trifluoromethyl)-2-methyl-4-oxo-4H-pyrano[3,2-c]quinolone 3-carboxylate, respectively. The structures of the synthesized compounds were confirmed by elemental analysis and spectral data.
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ACKNOWLEDGMENTS
All spectral measurements were carried out at the NMR laboratory of the Cairo University, and the NMR laboratory of the Faculty of Pharmacy, Ain Shams University, Egypt. The elemental analyses were obtained at the Central Lab, Cairo University, the Egypt Ministry of Defense Chemical Laboratories and the Micro Analytical Center, Ain Shams University. The authors would like to extend their sincere appreciation to all these institutions for cooperation in the present research.
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Regal, M.K.A., Shabana, S.S. & El-Metwally, S.A. Reactivity and Anticancer Assessment of 4-Hydroxyquinoline Derivatives. Russ J Org Chem 56, 307–314 (2020). https://doi.org/10.1134/S1070428020020219
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DOI: https://doi.org/10.1134/S1070428020020219