p-Toluenesulfonic acid → 3-(2-phenoxyethoxy)-1H-pyrazol-5-amine

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A mixture of 2-phenoxyethanol (56.1 g, 406 mmol), 3-amino-1H-pyrazol-5-ol (8.0648 g, 81.4 mmol) and TsOH (30.96 g, 162.8 mmol) was stirred at 130° C. under vacuum for 11 h. After cooled down to room temperature, the solid was washed with MeCN (200 mL), then treated with 6% aqueous NaHCO3 solution (500 mL). The suspension was filtered, and the solid collected was dissolved in EtOAc (100 mL), dried over MgSO4, filtered and concentrated, giving the title compound (5.4734 g, 30.7% yield). ESI m/z=220.19 [(M+1)+; calcd for C11H13N3O2+H: 220.11].

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