反应详情

温度

80 °C

Unpurified tert-butyl 4-(3-oxo-3-pyridin-2-ylpropanoyl)piperidine-1-carboxylate (2.00 g, 6.02 mmol) was dissolved in 20 ml of EtOH and hydrazine hydrate (0.321 ml, 6.62 mmol) was added and the reaction was warmed to 80° C. After 15 h the reaction was concentrated in vacuo and the residue was purified by flash column chromatography (dissolve in DCM, elute with 98:2 to 95:5 DCM/MeOH). tert-Butyl 4-(3-pyridin-2-yl-1H-pyrazol-5-yl)piperidine-1-carboxylate was obtained as a yellow oil. 1H NMR (CDCl3): δ 8.60 (m, 1H), 7.73 (dt, J=1.7, 7.6 Hz, 1H), 7.65 (d, J=7.8 Hz, 1H), 7.22 (m, 1H), 6.57 (s, 1H), 4.18 (bs, 2H), 2.89 (m, 4H), 2.00 (d, J=12.5 Hz, 2H), 1.67 (m, 2H), 1.48 (s, 9H). m/z (m+1): 329.2

1. concentrationAfter 15 h the reaction was concentrated in vacuo
2. customthe residue was purified by flash column chromatography (dissolve in DCM, elute with 98:2 to 95:5 DCM/MeOH)