In the chemical reaction process, reaction time, type of solvent, can easily affect the result of the reaction, thereby determining the yield and properties of the reaction product. An updated downstream synthesis route of 37622-90-5 as follows. Application In Synthesis of Ethyl 4-pyrazolecarboxylate
General procedure: Step 1: Ethyl 1-(4-fluorobenzyl)-1H-pyrazole-4-carboxylate Sodium hydride (60% oil dispersion; (2.869 g, 71.7 mmol)) was added portion wise to a cold (0 C.) solution of ethyl 1H-pyrazole-4-carboxylate (6.7 g, 47.81 mmol) in DMF (70 mL). The mixture was stirred for 1 hour at 0 C. followed by the addition of 1-(bromomethyl)-4-fluoro-benzene (10.85 g, 57.38 mmol). The reaction was warmed to room temperature and stirred for 18 hours. The reaction mixture was poured into water and the resulting precipitate was collected by vacuum filtration, washed with water, and dried under vacuum at 50 C. for 20 hours to afford the title compound, wt. 8.3 g (70% yield); 1H NMR (400 MHz, DMSO-d6) delta 8.47 (d, J=0.7 Hz, 1H), 7.87 (d, J=0.7 Hz, 1H), 7.34 (dd, J=8.6, 5.6 Hz, 2H), 7.18 (t, J=8.9 Hz, 2H), 5.35 (s, 2H), 4.20 (q, J=7.1 Hz, 2H), 1.25 (t, J=7.1 Hz, 3H).
According to the analysis of related databases, 37622-90-5, the application of this compound in the production field has become more and more popular.