Electric Literature of 89717-64-6, 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. 89717-64-6, name is 4-Bromo-3-nitro-1H-pyrazole belongs to pyrazoles-derivatives compound, it is a common compound, a new synthetic route is introduced below.
To a solution of 4-bromo-3- nitro-lH-pyrazole (1.5 g, 7.8 mmol) in anhydrous THF (50 mL) was added phenylboronic acid (0.95 g, 7.8 mmol), copper(II) acetate (2.1 g, 11.7 mmol) and pyridine (2.5 g, 31.2 mmol. The mixture was stirred overnight at 40C under oxygen atmosphere. After removing the insolubles by filtration, the filtrate was diluted with EtOAc (50 mL), washed with water (50 mL) and brine (50 mL), dried over a2S04, filtered and concentrated in vacuo to obtain a residue which was purified by silica gel chromatography (eluting with hexane/EtOAc = 1/1) to afford 4-bromo-3-nitro-l -phenyl- lH-pyrazole as a yellow solid (2.0 g, Yield: 95%). ESI- LCMS (m/z): 268.0 [M+l]
The synthetic route of 4-Bromo-3-nitro-1H-pyrazole has been constantly updated, and we look forward to future research findings.
Reference:
Patent; EPIZYME, INC.; CAMPBELL, John Emmerson; (178 pag.)WO2016/44666; (2016); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics