Water → 5-Amino-3-ethyl-1-(2,4,6-trichlorophenyl)pyrazole-4-carboxamide

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Part A: To a stirred solution of 320 mg (1.9 mmol) of 2-cyano-3-ethoxypentenamide in 7 mL of MeOH was added 465 mg (2.2 mmol) of 2,4,6-trichlorophenylhydrazine. The solution was stirred 3 h at reflux, treated with 2 mL of water, and allowed to stir an additional 1 h, cooling to RT. The white solid which precipitated was filtered, washed with 2:1 MeOH-water, and air-dried to afford 520 mg (82%) of 5-amino-3-ethyl-1-(2,4,6-trichlorophenyl)pyrazole-4-carboxamide, mp 186-188° C., Mass Spec (CI+): 331.9989 (M)+.

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