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. 26621-44-3, name is 3-Nitro-1H-pyrazole belongs to pyrazoles-derivatives compound, it is a common compound, a new synthetic route is introduced below. 26621-44-3
General procedure: 3-methoxy-1H-pyrazole 14f (0.15 g, 1.53 mmol) was dissolved in dry pyridine (15 mL) and DMAP (0.02 g, 1.15 mmol) was added, followed by hexyl isocyanate (0.33 mL, 2.3 mmol). The resulting solution was stirred under nitrogen atmosphere at rt for 12 h. The solvent was evaporated under reduced pressure and the two regioisomers 23f and 24f were obtained in a ratio of 92:8, determined by 1H NMR of the crude. The mixture was separated by silica gel column chromatography using cyclohexane/EtOAc. 23f eluted with cyclohexane/EtOAc 99.5:0.5 and 24f eluted with cyclohexane/EtOAc 90:10.
The synthetic route of 26621-44-3 has been constantly updated, and we look forward to future research findings.