Hydrochloric Acid → 3-tert-butyl-1-(4-(methylsulfonyl)phenyl)-1H-pyrazol-5-amine

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반응 단계

4-(methylsulfonyl)phenylhydrazine hydrochloride (1.133 g, 5.09 mmol) and 4,4-dimethyl-3-oxopentanenitrile (0.697 g, 5.57 mmol) were weighed into a 100 mL RBF. 0.2 M HCl in EtOH (42 mL) was added and the suspension was heated to reflux for 27 h, during which time all solids gradually dissolved to give a yellow solution. The solution was diluted with 1 M NaOH(aq) (˜16 mL) to pH 12-13, EtOAc (70 mL) was added and the biphasic system was vigorously stirred for 5 min. The organic layer was isolated, dried (MgSO4), filtered and concentrated to give a yellow crystalline solid. Yield: 1.42 g (95%).

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