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. 400755-44-4, name is 1-Ethylpyrazole-3-carboxylic Acid, A new synthetic method of this compound is introduced below., HPLC of Formula: C6H8N2O2
To 1 -ethyl- 1H- pyrazole-3-carboxylic acid (5.01 g, 35.7 mmol) in benzene/MeOH (45 mL/10 mL) at 0 C was added drop wise (diazomethyl)trimethylsilane (19.7 mL, 39.3 mmol) in hexanes (2M). The cold bath was removed and the reaction mixture was stirred at ambient temperature for one hour. The reaction was quenched with the addition of acetic acid (0.25 mL). The mixture was concentrated under reduced pressure to give crude product, to which was added THF (50 mL) and the solution was cooled to 0 C. Lithium aluminum hydride (1.36 g, 35.7 mmol) was added cautiously to the solution. The cold bath was removed once the addition was complete. The mixture was stirred at ambient temperature for 2 hours and the reaction was quenched by careful addition of sodium sulfate decahydrate. The mixture was filtered through Celite, and the filter pad was washed with EtOAc (200 mL). The filtrate was concentrated under reduced pressure to give the product (4.41 g).
The basis of chemical reaction formula synthesis, the synthesis route is composed of some specific reactions and combined according to certain logical thinking. We look forward to the emergence of more reaction modes in the future.
Reference:
Patent; ARRAY BIOPHARMA INC.; BOYS, Mark Laurence; BRADLEY, Michael; DELISLE, Robert Kirk; HENNINGS, D. David; KENNEDY, April L.; MARMSATER, Fredrik P.; MEDINA, Matthew; MUNSON, Mark C.; RAST, Bryson; RIZZI, James P.; RODRIGUEZ, Martha E.; TOPALOV, George T.; ZHAO, Qian; WO2011/79076; (2011); A1;,
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