反应详情

温度

47.5 °C

BrCH2CN (3.19 g, 25.82 mmol) was added dropwise to a solution of 3-hydroxypiperidine (6.53 g, 64.55 mmol) in dry THF (25 mL) under N2, maintaining the temperature between 45-50° C. Following addition of BrCH2CN, the solution was refluxed for 30 min., before allowing the solution to cool down to room temperature. The solvent was removed in vacuo and the residual oil was purified by flash chromatography using CH2Cl2:CH3OH (9:1) as eluent. The title compound was obtained as a straw-coloured oil (3.04 g, 83%). δh (250 MHz; CDCl3); 1.9-2.15 (m, 3H, CH2CH2CH2, 1×CH2CH2CHOH), 2.25 (m, 1H, 1×CH2CH2CHOH), 2.55 (d, OH), 2.85-3 (m, 3H, NCH2CH2, 1×NCH2CH), 3.1 (2×d, 1H, 1×NCH2CH), 3.9 (s, 2H, NCH2CN) and 4.3 (m, 1H, CH2CHOH); FAB MS, m/z (M+H)+141.

1. temperaturethe solution was refluxed for 30 min.
2. temperatureto cool down to room temperature
3. customThe solvent was removed in vacuo
4. customthe residual oil was purified by flash chromatography