反应详情

温度

0 °C

4-Pyridin-2-ylpiperidine-4-carbonitrile (1-2) (3.55 g, 19 mmole) was dissolved in DCM-DIEA (v/v 5:1, 60 mL) at 0° C. To this solution was added n-PrSO2Cl (2.98, 21 mmole). The reaction mixture was then stirred for 1 h at 0° C. After this time, LCMS indicated that the reaction was completion. 2N NaOH (40 mL) was added and the reaction mixture was stirred 1 h at 0° C. The reaction mixture solution was then extracted with EtOAc (4×200 mL). The combined EtOAc extracts were washed with brine, dried over MgSO4, filtered, concentrated to afford the desired product 1-(propylsulfonyl)-4-pyridin-2-ylpiperidine4-carbonitrile (I-4A) as a yellow-brown solid. Analytical LCMS: single peak (214 nm), 2.642 min. This product was used in next step reaction without further purification.

1. stirringthe reaction mixture was stirred 1 h at 0° C
2. extractionThe reaction mixture solution was then extracted with EtOAc (4×200 mL)
3. washThe combined EtOAc extracts were washed with brine
4. dry with materialdried over MgSO4
5. filtrationfiltered
6. concentrationconcentrated