Hydrochloric Acid → 1-ethyl-3-[2-oxo-2-(1-pyrrolidinyl)ethyl]-1H-pyrazol-5-amine

To a solution of N-{1-ethyl-3-[2-oxo-2-(1-pyrrolidinyl)ethyl]-1H-pyrazol-5-yl}-2,2,2-trifluoroacetamide (120 mg, 0.377 mmol) in methanol (1.5 mL) was added 2M HCl (1 mL, 0.377 mmol), and the reaction mixture was stirred at 50° C. for 2 h and concentrated. The residue was neutralized using saturated NaHCO3 solution and concentrated. The residue was dried under high vacuum to give 79 mg and used for next reaction without further purification. MS: (M+H)+=222.8. 1H NMR (400 MHz, DMSO-d6) ppm 1.18 (t, J=7.2 Hz, 3H), 1.70-1.85 (m, 4 H), 3.24 (t, J=6.8 Hz, 2H), 3.31 (s, 2 H), 3.43 (t, J=6.8 Hz, 2H), 3.78 (q, J=7.2 Hz, 2H), 5.11 (s, 1H).