反应详情

A solution of 2-benzyl-4-vinylisoindoline (58 mmol) in 1,2-dichloroethane (150 mL) was placed in a 1 L round bottom flask under nitrogen. To this was attached an addition funnel containing a solution of 1-chloroethyl chloroformate (7.51 mL, 69.6 mmol) in 1,2-dichloroethane. The reaction flask was cooled in an ice bath and the contents of the addition funnel were added dropwise over 20 min keeping the internal reaction temperature<5° C. After the addition was complete the reaction flask was allowed to warm to room temperature then heated to reflux for 45 min. The contents of the reaction flask were cooled to room temperature then the solvent removed by evaporation. Methanol (200 mL) was added and the contents of the reaction flask were heated to reflux for 30 min. The reaction flask was cooled and the solvent removed by evaporation. Water (200 mL) was added and the resulting mixture washed with ethyl acetate (2×250 mL). The aqueous layer was made basic with 2N sodium hydroxide then extracted with methylene chloride (4×250 mL). The combined organic extracts were dried with anhydrous sodium sulfate, filtered and the filtrate evaporated. The remaining residue was subjected to flash column chromatography eluting with methylene chloride/methanol/ammonium hydroxide 97/3/0.3 to 95/5/0.5. Evaporation of fractions gave the title compound as a brown oil, 6.00 g (41.4 mmol, 71% yield for two steps). LRMS (ESI) m/z 146 [(M+H)+; calcd for C10H12N: 146].

1. temperatureThe reaction flask was cooled in an ice bath
2. additionthe contents of the addition funnel were added dropwise over 20 min
3. customthe internal reaction temperature<5° C
4. additionAfter the addition
5. temperaturethen heated
6. temperatureto reflux for 45 min
7. temperatureThe contents of the reaction flask were cooled to room temperature
8. customthe solvent removed by evaporation
9. additionMethanol (200 mL) was added
10. temperaturethe contents of the reaction flask were heated
11. temperatureto reflux for 30 min
12. temperatureThe reaction flask was cooled
13. customthe solvent removed by evaporation
14. additionWater (200 mL) was added
15. washthe resulting mixture washed with ethyl acetate (2×250 mL)
16. extractionthen extracted with methylene chloride (4×250 mL)
17. dry with materialThe combined organic extracts were dried with anhydrous sodium sulfate
18. filtrationfiltered
19. customthe filtrate evaporated
20. washeluting with methylene chloride/methanol/ammonium hydroxide 97/3/0.3 to 95/5/0.5
21. customEvaporation of fractions