Methyl 4-formylbenzoate: Synthesis, Materials Science, and Biomedical Applications

Methyl 4-formylbenzoate (also known as terephthalaldehyde mono-methyl ester) is an organic eater and aldehyde whicht is usually a white to milky white crystalline power or lumps. It is an important multifunctional building block widely applied in organic synthesis, material science, and biomedical research.

General Preparation of Methyl 4-formylbenzoate Compounds

To prepare methyl 4-formylbenzoate, a solution of methyl 4-bromobenzoate (1.0 mmol) in DMF (0.6 M) was added with 17 mol % bis (triphenylphosphine)palladium(II) dichloride and sodium formate (1.5 equiv). The reaction mixture was stirred at 110 °C under a steady stream of CO(g) for 2 h. After cooling to room temperature, the mixture was diluted with saturated sodium carbonate solution and extracted with ethyl acetate (2×). The combined organic layers were washed with brine, dried over MgSO4, filtered, and concentrated under reduced pressure. The crude produce was achieved via flash column chromatography on silica gel (hexanes/EtOAc: 3:1) to yield the desired product, which was taken on without further purification. [1]

Polymerization and Functional Modification for Anion Exchange Membrane Applications

Methyl 4-formylbenzoate (MFB), as an inexpensive and commercially available monomers, can be synthesized together with 1,2-dimethoxybenzene (DMB) through a metal-free, acid-catalyzed Friedel-Crafts hydroxyalkylation polycondensation to constructed a high molecular weight poly( dimethoxybenzene-co-methyl 4-formylbenzoate) (PDMB)-based anion exchange membranes (AEMS). After the polymer is formed, the methyl ester group (-COOCH3) on the MFBS can be further modified through hydrosis or amidation to introduce quaternary ammonium groups to improve the ionic conductivity of membranes. The as-prepared AEMs showed a high hydroxide conductivity and good alkaline stability. Furthermore, the AEMs with high ion exchange capacity displayed high mechanical properties and good dimensional stability. [2]

Biological Activity and Drug Development Potential of MFB-Derived Phenylhydrazones

Methyl 4-formybenzoate (MFB) is a core precursor monomer in biological study and its corresponding phenylhydrazones which are synthesized by undergoing a condensation reaction with aldehyde group and phenylhydrazine pass possible toxicological risks, antiviral, antibacterial, antifungal activities and antiretroviral activities tests, so they can be recommended as effective drugs in the treatment of a number of diseases. The benzoate group in MFB methyl 4-formybenzoate has great contribution to the overall biological activity. The carbon atoms in the combination of the phenylhydrazone with eater group exhibit both nucleophilic and electrophilic properties, facilitating isomerization and further functionalization. Results suggest that methyl 4-formybenzoate-based compounds even show activity in cytotoxicity predictions against breast cancer cell lines (e.g., MCF7-DOX). These make methyl 4-formybenzoate derivatives as important research objects for the development of new antibacterial and anticancer drugs. [3]

Catalytic Model Substrate and Reactor Technology Applications

Methyl 4-formybenzoate is a common substrate for testing new catalytic methods, reactor technologies and chemoselective reactions, and it has significance in developing high automated synthetic devices. For the compound which is used in a mechanistic study of nickel-catalyzed reductive coupling methyl 4-formybenzoate is selected as the coupling aldehyde for its unique infrared (Ir) profile to avoid band overlap. The study explores how the aldehyde reacts with ynoates to form 1,4-difunctionalized molecules, and provides kinetic study into the limiting steps of the catalytic cycle. For the chemoselectivity of sodium brohydride (NaBH4), methyl 4-formybenzoate as a model molecule with two main functional groups: an aldehyde (highly reactive) and a methyl ester (less reactive), it can demonstrate this reagent only reduces the aldehyde group in the molecule without affecting the ester group. The use of methyl 4-formylbenzoate can prove that NaBH4 is a mild reducing agent capable of differentiating between similar carbonyl-containing functional groups. Methyl 4-formybenzoate can also act as a model aldehyde to test the effect of micro-reactor technology. It reacts with a phosphonium salt through Wittig chemistry to synthesize nitrostillbene esters. Using micro-channels has more accurate control and a higher product yield (70%) compared to traditional batch synthesis. [4] [5] [6]

References:

[1] Zimmerman, S. S., Khatri, A., Garnier-Amblard, E. C., Mullasseril, P., Kurtkaya, N. L., Gyoneva, S., ... & Liotta, D. C. (2014). Design, synthesis, and structure–activity relationship of a novel series of GluN2C-selective potentiators. Journal of Medicinal Chemistry, 57(6), 2334–2356. https://doi.org/10.1021/jm401695d

[2] Zhu, H., Sun, Z., Cao, H., Wang, B., Zhao, J., Pan, J., ... & Yan, F. (2021). Highly conductive and dimensionally stable anion exchange membranes based on poly (dimethoxybenzene-co-methyl 4-formylbenzoate) ionomers. Macromolecules, 54(12), 5557-5566.

[3] Ibrahimova, S. A., Mukhtarova, S. H., Eyvazova, S. M., Musayeva, S. A., Hamdullayeva, I. H., Rustemova, G. R., ... & Shikhaliyev, N. Q. (2024). Prediction of biological activity by means of synthesis and QSAR model of phenylhydrazone based on methyl 4-formylbenzoate. New Materials, Compounds and Applications, 8(3), 373-389.

[4] Rodrigo, S. K., & Guan, H. (2017). Mechanistic Study of Nickel-Catalyzed Reductive Coupling of Ynoates and Aldehydes. The Journal of Organic Chemistry, 82(10), 5230-5235.

[5] Skelton, V., Greenway, G. M., Haswell, S. J., Styring, P., Morgan, D. O., Warrington, B., & Wong, S. Y. F. (2001). The preparation of a series of nitrostilbene ester compounds using micro reactor technology. The Analyst, 126(1), 7–10. https://doi.org/10.1039/b006728h

[6] Baru, A. R., & Mohan, R. S. (2005). The discovery-oriented approach to organic chemistry. 6. Selective reduction in organic chemistry: Reduction of aldehydes in the presence of esters using sodium borohydride. Journal of chemical education, 82(11), 1674.

You may like