Chemical Properties
White Crystalline Solid
Uses
Ethyl 1-methyl-1H-imidazole-2-carboxylate is a useful synthetic intermediate for solid phase synthesis of polyamides containing imidazole.
Uses
Ethyl 1-methylimidazole-2-carboxylate is used as a synthetic intermediate for solid phase synthesis of polyamides containing imidazole.
Synthesis
Synthesis of ethyl 1-methyl-1H-imidazole-2-carboxylate: triethylamine (3.40 mL, 24.4 mmol) and ethyl chloroformate (2.34 mL, 24.4 mmol) were added drop-wise to a solution of 1-methyl-1H-imidazole (1.00 g, 12.2 mmol) in acetonitrile (4.0 mL) at 0 °C. The reaction mixture was stirred at room temperature for 16 hours. After completion of the reaction, the mixture was filtered through diatomaceous earth and the filtrate was concentrated under reduced pressure to remove the solvent. The resulting crude product was purified by fast column chromatography (silica gel as stationary phase and hexane/ethyl acetate as eluent) to afford ethyl 1-methyl-1H-imidazole-2-carboxylate (1.50 g, 9.73 mmol, 80% yield) as a white solid. The structure of the product was confirmed by 1H-NMR (400 MHz, CDCl3) and ESI-MS: 1H-NMR δ 1.42 (3H, t, J = 7.2 Hz), 4.01 (3H, s), 4.40 (2H, q, J = 7.2 Hz), 7.01-7.03 (1H, m), 7.13-7.15 (1H, m); ESI-MS m /z = 155 (M + H)+.
References
[1] Journal of the American Chemical Society, 1996, vol. 118, # 26, p. 6141 - 6146
[2] Patent: EP3263565, 2018, A1. Location in patent: Paragraph 0386; 0387
[3] Patent: JP2017/66077, 2017, A. Location in patent: Page/Page column 7; 8; 9; 10; 11
[4] Patent: WO2005/33077, 2005, A1. Location in patent: Page/Page column 53
[5] Patent: WO2004/58763, 2004, A1. Location in patent: Page 43
