Chemical Properties
Yellow solid
Uses
2-Amino-4-phenyl-thiophene-3-carboxylic acid ethyl ester is a synthetic intermediate useful for pharmaceutical synthesis.
Uses
Ethyl 2-Amino-4-phenylthiophene-3-carboxylate is used in the design and synthesis of thieno[2,3-d]pyrimidine analogs which exhibits antiproliferative activity against human cancer cells such as liver, pancreatic and colorectal cancer.
Synthesis
Ethyl 2-cyano-3-phenylbut-2-enoate (513.25 g, 2.3 mol) was slowly added to a vigorously stirred ethanol (500 mL) suspension of sulfur powder (76 g, 2.3 mol) at room temperature. Subsequently, diethylamine (200 mL) was added in batches over a period of 20 min, and the temperature was raised to 62 °C during the reaction. Upon completion of the reaction, the mixture was cooled to 36 °C, then heated to 50 °C and stirred continuously for 1 h at this temperature. After stopping stirring, unreacted sulfur was removed by decantation and the hot solution was cooled to room temperature. The resulting orange solid product, ethyl 2-amino-4-phenylthiophene-3-carboxylate (195 g) was collected by filtration and washed with a small amount of cold ethanol and finally dried under vacuum. The resulting product was used for subsequent experiments without further purification.
References
[1] Synthetic Communications, 2007, vol. 37, # 23, p. 4273 - 4279
[2] Patent: WO2012/131379, 2012, A1. Location in patent: Page/Page column 19
[3] Patent: US2014/206703, 2014, A1. Location in patent: Paragraph 0033; 0084; 0085
