反应详情

温度

0 °C

Thionyl chloride (45 mL, 622.5 mmol) was slowly added to a solution of 4-hydroxy-4-(3-pyridyl)cyclohexanone ethylene ketal (prepared as in step a, 29.3 g, 124.5 mmol) in pyridine (250 mL) at −10° C. After stirring at 0° C. for 2.5 h, the reaction mixture was poured onto ice and adjusted to pH 8 with 2 N NaOH. The aqueous layer was extracted with CH2Cl2 (100 mL×3) and the combined organic layers were washed with brine (200 mL), dried with MgSO4, and concentrated in vacuo to afford crude 4-(3-pyridyl)cyclohex-3-en-1-one ethylene ketal, which was used without further purification.

1. additionthe reaction mixture was poured onto ice
2. extractionThe aqueous layer was extracted with CH2Cl2 (100 mL×3)
3. washthe combined organic layers were washed with brine (200 mL)
4. dry with materialdried with MgSO4
5. concentrationconcentrated in vacuo