Uses
2-Acetyl-5-chlorothiophene serves as a precursor for synthesizing thiophene chalcones via Claisen-Schmidt condensation with heterocyclic or aromatic aldehydes, such as benzaldehyde, 4-chlorobenzaldehyde, and 2,4-dimethoxybenzaldehyde, in the presence of sodium hydroxide[6-8].
Synthesis
Example 8: In a 100 mL four-necked flask equipped with a stirrer, a condenser, a thermometer, and a dropping funnel, 5.9 g of activated white clay (a product of Nacalai Tesque, Inc.) and 25.5 g (0.25 mol) of acetic anhydride were added sequentially. The temperature of the reaction system was maintained at 45 °C to 55 °C and 29.6 g (0.25 mol) of 2-chlorothiophene was slowly added dropwise over 1 h in this temperature range. After the dropwise addition was completed, the reaction was continued with stirring at 50 °C for 72 hours. Upon completion of the reaction, the activated white clay was removed by filtration to give a dark brown filtrate. Subsequently, unreacted 2-chlorothiophene, acetic anhydride and the by-product acetic acid were removed from the filtrate by distillation, resulting in 20.9 g (0.13 mol) of 2-acetyl-5-chlorothiophene.
References
[1] Patent: EP1695972, 2006, A1. Location in patent: Page/Page column 7
[2] Journal of the American Chemical Society, 1947, vol. 69, p. 3093,3095
[3] Journal of Organic Chemistry, 1948, vol. 13, p. 729,732
[4] Org. Synth. Coll. Vol. IV,<1963>980,
[5] Journal of the American Chemical Society, 1947, vol. 69, p. 1014
[6]
Al-Maqtari, H. M., Jamalis, J., & Sirat, H. M. (2015). SYNTHESIS AND CHARACTERIZATION OF HETEROCYCLIC CHALCONES CONTAINING HALOGENATED THIOPHENES. Jurnal Teknologi, 77(3).
https://doi.org/10.11113/jt.v77.6005 [7]
Wulan, F. F., Astuti, E., Prasetyo, N., Kumar, N., Wahyuningsih, T. D. (2025). Investigating chlorothiophene-based chalcones as anticancer agents: Synthesis, biological evaluation, and computational insight via the p53-targeted pathway. Arabian Journal of Chemistry, 18, 312024.
https://doi.org/10.25259/ajc_31_2024 [8]
Gita, B., Rusydi, I. D., Astuti, E., Wahyuningsih, T. D. (2026). Synthesis of novel 2-acetyl-5-chlorothiophene-based pyrazoline as “turn-off” fluorescence sensors for Hg2+. AIP Conference Proceedings, 3358, 050004.
https://doi.org/10.1063/5.0296571
