Researchers who often do experiments know that organic synthesis is a process of preparing more complex target molecules from simple raw materials through one or more chemical reactions. Generally, it requires fewer steps, and cheap raw materials. 55864-87-4, name is Ethyl 4-nitro-1H-pyrazole-3-carboxylate, A new synthetic method of this compound is introduced below., Quality Control of Ethyl 4-nitro-1H-pyrazole-3-carboxylate
To a mixture of A32 (5.45 g, 29.4 mmol, 1 eq) and 3,4-dihydro-2H-pyran (7.43 g, 88.3 mmol, 8.07 mL, 3 eq) in THE (40 mL) was added TsOH (507 mg, 2.94 mmol, 0.1 eq). The resulting mixture was stirred at 80 C for 16 hours to give a yellow solution. TLC (PE/EtOAc = 3/1) showed the reaction was completed. The reaction mixture was quenched with H20 (100 mL) and extracted with EtOAc (50 mL x 2). The organic layer were washed with brine (20 mL x 3), dried over anhydrous Na2S04, filtered and concentrated under reduced pressure to give a residue. The residue was purified by silica gel column chromatography (Si02, PE/EtOAc = 3:1) to give 7.01 g (yield: 88.4%) of A37 as a yellow oil.
The synthetic route of 55864-87-4 has been constantly updated, and we look forward to future research findings.