{"id":834,"date":"2020-10-21T11:15:50","date_gmt":"2020-10-21T03:15:50","guid":{"rendered":"https:\/\/www.pyrazoles-derivatives.com\/?p=834"},"modified":"2020-10-21T11:15:50","modified_gmt":"2020-10-21T03:15:50","slug":"brief-introduction-of-112758-40-4","status":"publish","type":"post","link":"https:\/\/www.pyrazoles-derivatives.com\/?p=834","title":{"rendered":"Brief introduction of 112758-40-4"},"content":{"rendered":"

In the next few decades, the world population will flourish. As the population grows rapidly and people all over the world use more and more resources, all industries must consider their environmental impact. 112758-40-4, name is 3-Methyl-1H-pyrazole-4-carbaldehyde belongs to pyrazoles-derivatives compound, it is a common compound, a new synthetic route is introduced below. 112758-40-4<\/a><\/p>\n

To a solution of 3 -methyl- lH-pyrazole-4-carbaldehyde (1 g, 9.08 mmol) in acetonitrile (10 mL) is added potassium carbonate (1.76 g, 12.71 mmol) and 2,3- difluornitrobenzene (1.73 g, 10.90 mmol) and the mixture is stirred at room temperature overnight. Water is added and the organic phase is extracted with ethyl acetate. Organic layer is dried over sodium sulfate and the solvent evaporated under reduced pressure. The residue is purified by normal phase Isco chromatography using as eluent ethyl acetate\/hexane (20-80%) to give a 62% yield of a mixture of regioisomers containing the title compound as major product that is used with no further purification. NMR is consistent with desired structure, although mixture of regiosomers is detected: NMR (MeOD): 9.98 (s, 1H), 8.65 (d, 1H, J= 1.6 Hz), 7.99-7.26 (m, 3H), 2.49 (s, 3H). A mixture of l-(2-fluoro-6-nitro-phenyl)-3 -methyl- lH-pyrazole-4-carbaldehyde (620 mg; 2.49 mmol) (as major compound in a mixture of regioisomers in the pyrazole) and Iron (1.40 g) in ethanol (5.1 mL) and water (5.1 mL) with few drops of acetic acid is heated at 90C for 2h. After that time, it is filtered over celite, and eluted with more ethanol. Mixture is concentrated under vacuum, basified with sodium bicarbonate (saturated aqueous solution) and extracted with dichloromethane. Organic layer is decanted, dried over magnesium sulfate and solvent evaporated under reduced pressure to give 500 mg of the title compound, as major product in a mixture of regioisomers in the pyrazole, that is used without further purification. MS (m\/z): 220 (M+l).<\/p>\n

The synthetic route of 112758-40-4 has been constantly updated, and we look forward to future research findings.<\/p>\n","protected":false},"excerpt":{"rendered":"

The synthetic route of 112758-40-4 has been constantly updated, and we look forward to future research findings.<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[168,131],"tags":[126],"class_list":["post-834","post","type-post","status-publish","format-standard","hentry","category-112758-40-4","category-pyrazoles-derivatives","tag-m-w100-200"],"yoast_head":"\nBrief introduction of 112758-40-4<\/title>\n<meta name=\"description\" content=\"In the next few decades, the world population will flourish. 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