Adding a certain compound to certain chemical reactions, such as: 138786-86-4, name is Methyl 4-nitro-1H-pyrazole-3-carboxylate, belongs to pyrazoles-derivatives compound, can increase the reaction rate and produce products with better performance than those obtained under traditional synthetic methods. Here is a downstream synthesis route of the compound 138786-86-4, Safety of Methyl 4-nitro-1H-pyrazole-3-carboxylate
Reference Example 27 Methyl 4-nitro-1-trityl-1H-pyrazole-3-carboxylate To a solution of methyl 4-nitro-1H-pyrazole-3-carboxylate obtained in Reference Example 18 (5.0 g, 29.0 mmol) and triethylamine (4.5 mL, 32.0 mmol) in DMF (50 mL), trityl chloride (8.9 g, 32.0 mmol) was added at 0 C., and the mixture was stirred at room temperature for 4 hr. The mixture was diluted with water, and extracted with ethyl acetate. The extract was washed with saturated aqueous sodium hydrogencarbonate solution, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure, and the obtained residue was purified by silica gel column chromatography (hexane-ethyl acetate 9:1) to give the title compound (7.3 g, yield 61%). 1H-NMR (CDCl3): delta 3.28 (3H, s), 7.14-7.19 (5H, m), 7.30-7.35 (10H, m), 8.11 (1H, s).
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Reference:
Patent; Tsukamoto, Tetsuya; Yamamoto, Takeshi; Tokunoh, Ryosuke; Kawamoto, Tomohiro; Okura, Masahiro; Kori, Masakumi; Murase, Katsuhito; US2009/156582; (2009); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics