Cyclopentylhydrazine hydrochloride → 1-Cyclopentyl-3-methyl-1H-pyrazol-5-amine

Participants

Reaction Steps

The title compound was prepared in the same manner as described for intermediate 19 using cyclopentylhydrazine hydrochloride (2 g, 14.64 mmol), (2Z)-3-amino-2-butenenitrile (1.202 g, 14.64 mmol) and ethanol (20 mL). The final product was collected as 0.57 g (24%). LCMS E-S (M+H)=166.0. 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 1.60-1.69 (m, 2 H), 1.86-1.95 (m, 2 H), 1.99-2.09 (m, 4 H), 2.19 (s, 3 H), 3.46 (br. s., 2 H), 4.38 (quin, J=7.89 Hz, 1 H), 5.36 (s, 1 H).

Provenance & Evidence