Reference of 52867-42-2,Some common heterocyclic compound, 52867-42-2, name is Methyl 2-methyl-5-oxo-2,5-dihydro-1H-pyrazole-3-carboxylate, molecular formula is C6H8N2O3, 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.
Example 25-[5-(4-Fluoro-phenyl)-3-methyl-3H-[1,2,3]triazol-4-ylmethoxy]-2-methyl-2H-pyrazole-3-carboxylic acid (tetrahydro-pyran-4-yl)-amide a) Methyl 5-[5-(4-fluoro-phenyl)-3-methyl-3H-[1,2,3]triazol-4-ylmethoxy]-2-methyl-2H-pyrazole-3-carboxylate; To a solution of [5-(4-fluoro-phenyl)-3-methyl-3H-[1,2,3]triazol-4-yl]-methanol (290 mg, 1.4 mmol) in THF (30 mL) was added 5-hydroxy-2-methyl-2H-pyrazole-3-carboxylic acid methyl ester (218 mg, 1.4 mmol) and triphenylphosphine (477 mg, 1.82 mmol) at ambient temperature under an argon atmosphere. Then diethyl azodicarboxylate (641 muL, 3.5 mmol) was added and the reaction mixture was stirred for 16 h at room temperature. Concentration and purification by chromatography (silica, 20 to 50% ethyl acetate in heptane) afforded the title compound (483 mg, 100%) as a white solid. MS: m/e=346.2 [M+H]+.
These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route Methyl 2-methyl-5-oxo-2,5-dihydro-1H-pyrazole-3-carboxylate, its application will become more common.