Researchers who often do experiments know that organic synthesis is a process of preparing more complex target molecules from simple raw materials through one or more chemical reactions. Generally, it requires fewer steps, and cheap raw materials. 146941-72-2, name is 4-Bromo-1-methyl-1H-pyrazol-3-amine, A new synthetic method of this compound is introduced below., Quality Control of 4-Bromo-1-methyl-1H-pyrazol-3-amine
A) Methyl 3-(4-bromo-1-methyl-1H-pyrazol-3-ylamino)propanoate A mixture of 4-bromo-1-methyl-1H-pyrazol-3-amine (3.50 g), methyl acrylate (8 mL), 4-(dimethylamino)pyridine (0.49 g) and DMF (3 mL) was stirred at 135C for 3 hours and 30 minutes under irradiation with microwave. Water and ethyl acetate were added to the reaction mixture to separate an organic layer. The aqueous layer was subjected to extraction with ethyl acetate. The combined extract was washed with saturated brine and dried over anhydrous sodium sulfate, and the solvent was distilled off under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/petroleum ether) to obtain the title compound (3.20 g). MS: [M+H]+ 261.8.
The basis of chemical reaction formula synthesis, the synthesis route is composed of some specific reactions and combined according to certain logical thinking. We look forward to the emergence of more reaction modes in the future.