反应详情

温度

35 °C

To 800 ml of the dichloromethane solution of N-benzoyl-4-hydroxymethylpiperidine (C) obtained in Example 2, which contains about 1 mol of N-benzoyl-4-hydroxymethylpiperidine, there was added dropwise 109 ml (1.5 mol) of thionyl chloride over 2 hours with keeping the reaction temperature at 25° to 30° C. Then the obtained reaction mixture was stirred at room temperature for 1 hour and at 35° C. for 8 hours. After the completion of the reaction, the solvent and the excess of thionyl chloride were removed by distillation to obtain 248.96 g of N-benzoyl-4-chloromethylpiperidine (D) as a yellowish brown oily matter. The NMR spectrum of the obtained compound was measured. The result is shown below.

1. customat 25° to 30° C
2. customThen the obtained reaction mixture
3. customAfter the completion of the reaction
4. customthe solvent and the excess of thionyl chloride were removed by distillation