反应详情

To 25.0 g. (0.09 mole) of 4-hydroxy-1-methyl-3,3-diphenyl-2-pyrrolidinone, in 200 ml. of chloroform was added 21.4 g. (0.18 mole) of thionyl chloride. With stirring and ice bath cooling, 18.0 g. (0.23 mole) of pyridine was added dropwise. The solution was refluxed for two hours. After concentrating in vacuo, the residue was dissolved in chloroform and washed successively with dilute hydrochloric acid solution and dilute sodium hydroxide. The chloroform solution was dried, filtered, and concentrated in vacuo. The solid residue was recrystallized from a 50:50 ethyl acetate-isopropyl ether mixture. It weighed 16.0 g. (59% yield) and melted at 120°-122° C.

1. temperatureice bath cooling
2. temperatureThe solution was refluxed for two hours
3. concentrationAfter concentrating in vacuo
4. dissolutionthe residue was dissolved in chloroform
5. washwashed successively with dilute hydrochloric acid solution and dilute sodium hydroxide
6. dry with materialThe chloroform solution was dried
7. filtrationfiltered
8. concentrationconcentrated in vacuo
9. customThe solid residue was recrystallized from a 50:50 ethyl acetate-isopropyl ether mixture