In the next few decades, the world population will flourish. As the population grows rapidly and people all over the world use more and more resources, all industries must consider their environmental impact. 31037-02-2, name is Ethyl 5-amino-1-methyl-1H-pyrazole-4-carboxylate belongs to pyrazoles-derivatives compound, it is a common compound, a new synthetic route is introduced below. 31037-02-2
1-Methyl-5-(2-nitro-phenylamino)-1H-pyrazole-4-carboxylic acid ethyl ester Sodium hydride (60% dispersion in oil, 7.0g, 170mmol) was added portionwise to a suspension of 5-amino-1-methyl-1H pyrazole-4-carboxylic acid ethyl ester (21.1g, 125mmol) in anhydrous THF (300ml) at 0C. The mixture was allowed to warm to room temperature and stirred for 0.75h then cooled to 0C. 1-fluoro-2-nitrobenzene (17.6g, 125mmol) was added and the resultant suspension was stirred at room temperature for 18h. EtOAc and 0.3M KHSO4 were added and separated. The aqueous layer was extracted with EtOAc and the combined organic layers were washed with brine, dried and concentrated invacuo. The residue was purified by flash chromatography on silica gel (eluant 50% hexanes/50% ethyl acetate) to yield 1-methyl-5-(2-nitro-phenylamino)-1H pyrazole-4-carboxylic acid ethyl ester (20.8g, 58%).
The synthetic route of 31037-02-2 has been constantly updated, and we look forward to future research findings.