反应详情

To a slurry of 128 mg. (3.2 mmoles) of sodium hydride (washed with petroleum ether) in 4 ml. of dimethylformamide was added 500 mg. (2.3 mmoles) of 1-ethyl-2-oxo-2,3-dihydro-pyrano[2,3-f]indole followed after 15 minutes of stirring by 0.36 ml. (3.2 mmoles) of 4-fluorophenylisocyanate. The reaction mixture was allowed to stir at room temperature for 30 minutes, and was then added to a mixture of dichloromethane (50 ml.) and ice water (50 ml.). The aqueous layer was extracted with 35 ml. of dichloromethane and was then acidified with 4N hydrochloric acid. The acidified layer was extracted with fresh dichloromethane, and the organic phase separated, dried over magnesium sulfate and concentrated under vacuum to dryness, 1.6 g. The residue was taken up in ethyl acetate, washed with a brine solution and dried over magnesium sulfate. Removal of the solvent gave 709 mg. of crude product. Recrystallization from dichloromethane-diisopropyl ether gave 490 mg. (60% yield) of product, m.p. 212°-214° C.

1. stirringto stir at room temperature for 30 minutes
2. extractionThe aqueous layer was extracted with 35 ml
3. extractionThe acidified layer was extracted with fresh dichloromethane
4. customthe organic phase separated
5. dry with materialdried over magnesium sulfate
6. concentrationconcentrated under vacuum to dryness, 1.6 g
7. washwashed with a brine solution
8. dry with materialdried over magnesium sulfate
9. customRemoval of the solvent
10. customgave 709 mg
11. customRecrystallization from dichloromethane-diisopropyl ether
12. customgave 490 mg