A common heterocyclic compound, 27258-33-9, name is 1-Methyl-1H-pyrazole-5-carbaldehyde, molecular formula is C5H6N2O, its traditional synthetic route has been very mature, but the traditional synthetic route has various shortcomings, such as complicated route, low yield, poor purity, etc, below Introduce a new synthetic route. 27258-33-9.
To a mixture of compound OI-5a (2 g, 18.2 mmol, 1.0 eq) in DMF (20 mL) was added NBS (4.86 g, 27.3 mmol, 1.5 eq). The mixture was stirred at room temperature for 16 h under nitrogen atmosphere. Then the mixture was filtered and extracted with water and ethyl acetate. The organic phase was dried over anhydrous Na2SO4 and concentrated under reduced pressure. The residue was purified by silica gel chromatography to afford compound OI-5b (2.3 g, 67%).
The synthetic route of 1-Methyl-1H-pyrazole-5-carbaldehyde has been constantly updated, and we look forward to future research findings.