Reference of 5334-39-4, In the chemical reaction process, reaction time, type of solvent, can easily affect the result of the reaction, thereby determining the yield and properties of the reaction product. An updated downstream synthesis route of 5334-39-4 as follows.
: To a solution of l-ethyi-5-hydroxy-piperidin-2-one (530 mg, 3.70 mmol), 3-methyl-4-nitro-lH-pyrazole (706 mg, 5.55 mmol) and PPrn (i ,46 g, 5.55 mmol) in THF (20 mL) was added dropwise DIAD (1.12 g, 5.55 mmol ) at 0 C over 20 min. After addition, the mixture was stirred at this temperature for 40 min, and then the resulting mixture was stirred at 20 C for 1 1 h. The reaction mixture was concentrated under reduced pressure. The residue was purified by silica gel column chromatography (PE:EtOAc = 5: 1 to 0: 1) to give a mixture of l-ethyl-5-(5-methyl-4-nitro-lH-pyrazol-l- yi)piperidin-2~one and l~ethyl-5-(3~methyl-4-nitro-lH~pyrazol-l~yl)piperidin~2-one as a yellow solid. LCMS: RT 0.881 min, m/z = 253.1 [M+H]+
According to the analysis of related databases, 5334-39-4, the application of this compound in the production field has become more and more popular.