Acetic Acid → 3-Methyl-1-(pyridin-2-yl)-1H-pyrazol-5-amine

関与物質

反応手順

To an ice-cold solution of aminocrotononitrile (82 g, 1.0 mol) and 2-hydrazinopyridine (120 g, 1.1 mol) in ethanol (300 mL) was added acetic acid (132 g, 2.2 mol), and the solution was heated under reflux for 3.5 hours. The solution was cooled to room temperature, and the solution was concentrated under reduced pressure, and water was added to the residue. The solution was made basic by the addition of an aqueous sodium hydroxide solution, and organic matter was extracted with ethyl acetate. The extract was washed with saturated brine and water, and dried over anhydrous magnesium sulfate, and the solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate) to give the title compound (156.3 g, 90% yield).

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