26621-44-3, 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 26621-44-3 as follows.
10.0 g (88.4 mmol) of 3-nitropyrazole and 14.4 g (97.2 mmol) of 2,3-dichloropyridine were initially charged in 50 ml of dimethylformamide, 23.9 g (173 mmol) of potassium carbonate were added and the reaction mixture was stirred at 125 C. for 18 hours. After cooling, the mixture was poured into water and the precipitated solid was filtered off. Recrystallization from isopropanol/water gave 18.1 g (90% of theory) of 3-chloro-2-(3-nitro-1H-pyrazol-1-yl)pyridine (log P: 1.83; MH+: 225.1; 1H-NMR (400 MHz, CD3CN, delta, ppm): 7.15 (s, 1H), 7.56 (d, 1H), 8.15 (d, 1H), 8.23 (d, 1H), 8.53 (m, 1H).
According to the analysis of related databases, 3-Nitro-1H-pyrazole, the application of this compound in the production field has become more and more popular.