1-cyclopropylhydrazine dihydrochloride

Conditions: temp:80.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A 100-mL round-bottom flask was charged with 3,3-diethoxypropanenitrile (0.600 g, 4.19 mmol), cyclopropylhydrazine di-hydrochloride (0.610 g, 4.21 mmol) and ethanol (20 mL), and the resulting solution stirred for 18 h at 80° C. The reaction mixture was cooled to room temperature and concentrated under vacuum. The residue was purified via column chromatography on silica gel (eluting with 10:1, dichloromethane/methanol) to afford 1-cyclopropyl-1H-pyrazol-5-amine (0.206 g, 36%) as light yellow oil. MS (ESI, pos. ion) m/z 124 [M+H]+. The reaction mixture was cooled to room temperature concentrated under vacuum The residue was purified via column chromatography on silica gel (eluting with 10:1, dichloromethane/methanol)

Conditions: temp:80.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A 100-mL round-bottom flask was charged with 3,3-diethoxypropanenitrile (0.600 g, 4.19 mmol), cyclopropylhydrazine di-hydrochloride (0.610 g, 4.21 mmol) and ethanol (20 mL), and the resulting solution stirred for 18 h at 80° C. The reaction mixture was cooled to room temperature and concentrated under vacuum. The residue was purified via column chromatography on silica gel (eluting with 10:1, dichloromethane/methanol) to afford 1-cyclopropyl-1H-pyrazol-5-amine (0.206 g, 36%) as light yellow oil. MS (ESI, pos. ion) m/z 124 [M+H]+. The reaction mixture was cooled to room temperature concentrated under vacuum The residue was purified via column chromatography on silica gel (eluting with 10:1, dichloromethane/methanol)