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. 52867-42-2, name is Methyl 2-methyl-5-oxo-2,5-dihydro-1H-pyrazole-3-carboxylate, A new synthetic method of this compound is introduced below., HPLC of Formula: C6H8N2O3
Example 782-Methyl-5-(5-methyl-3-pyridin-2-yl-isoxazol-4-ylmethoxy)-2H-pyrazole-3-carboxylic acid isopropylamidea) 2-Methyl-5-(5-methyl-3-pyridin-2-yl-isoxazol-4-ylmethoxy)-2H-pyrazole-3-carboxylic acid methyl esterTo a stirred solution of 5-hydroxy-2-methyl-2H-pyrazole-3-carboxylic acid methyl ester (355 mg, 2.28 mmol) and (5-methyl-3-pyridin-2-yl-isoxazol-4-yl)-methanol (432 mg, 2.28 mmol) in THF (10 mL) at 5 0C under argon was added triphenylphosphine (775 mg, 2.95 mmol), then diethyl azodicarboxylate (515 mg, 2.95 mmol) was added dropwise. The reaction mixture was warmed to room temperature overnight. Then the reaction mixture was evaporated and purified by chromatography (silica, heptane:ethyl acetate = 1 :1 to 7.5:2.5) to afford the title compound (220 mg, 30%) as a white solid. MS: m/e = 329.3 [M+H]+.
The synthetic route of 52867-42-2 has been constantly updated, and we look forward to future research findings.
Reference:
Patent; F. HOFFMANN-LA ROCHE AG; JAKOB-ROETNE, Roland; LUCAS, Matthew, C.; THOMAS, Andrew; WO2010/127975; (2010); A1;,
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