反应详情

温度

50 °C

To a solution of N-chlorosuccinimide (46.58 g, 349 mmol) in chloroform (211 mL) and pyridine (2.8 mL, 35 mmol) was added at room temperature within 15 min a solution of pyridine-2-carbaldehyde oxime (42.6 g, 349 mmol) in chloroform (1090 mL). The reaction mixture was stirred at 50° C. for 3 h and then cooled to room temperature. Within 15 min a solution of (E)-3-pyrrolidin-1-yl-but-2-enoic acid ethyl ester (63.9 g, 349 mmol) in chloroform (42 mL) was added to the reaction mixture, which then was heated again to 50° C. and a solution of triethylamine (48.6 mL, 349 mmol) in chloroform (42 mL) was added dropwise within 1 h. After stirring at 50° C. for 1 h the reaction mixture was cooled to room temperature and then poured on ice water (2 L). Extractive workup followed by drying over sodium sulfate, filtering and evaporation of the organic solvent furnished a dark brown oil. Chromatographic purification (silica, heptane:AcOEt=80:20 to 50:50) afforded the title compound (8.7 g, 11%) as a yellow oil MS: m/e=233.3 [M+H]+.

1. temperaturecooled to room temperature
2. temperaturethen was heated again to 50° C.
3. stirringAfter stirring at 50° C. for 1 h the reaction mixture
4. temperaturewas cooled to room temperature
5. additionpoured on ice water (2 L)
6. dry with materialby drying over sodium sulfate
7. filtrationfiltering
8. customevaporation of the organic solvent
9. customfurnished a dark brown oil
10. customChromatographic purification (silica, heptane:AcOEt=80:20 to 50:50)