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温度

0 °C

2-((3,3-Dimethyl)oxindolyl)ethanol and triethylamine (1.1 equivalent) were dissolved in dichloromethane, cooled to 0° C. under nitrogen with stirring and methanesulfonyl chloride (1 equivalent) was added. The mixture was stirred for 30 minutes, washed with cold dilute hydrochloric acid, dried (MgSO4), filtered and concentrated to dryness. The resulting oil was dissolved in acetonitrile and added to a solution of tetrahydro-β-carboline (1 equivalent) containing potassium carbonate (2.5 equivalent) and potassium iodide (0.1 equivalent). The reaction mixture was heated under reflux for three days under nitrogen. The solvent was removed under reduced pressure and the residue taken up in ethyl acetate. This solution was washed (×2) with water, dried (MgSO4), filtered and concentrated to dry under reduced pressure. Chromatography on silica gel (eluent ethyl acetate/methanol) gave an oil which was taken up in ethyl acetate. Maleic acid (1 equivalent) was added. The solution was refrigerated for 12 hours and the white crystals collected to given 1-(2-(1,2,3,4-tetrahydro-9H-pyrido[3,4-b]indol-2-yl)-1-ethyl)-1,3-dihydro-3,3-dimethyl-2H-indol-2-one as its monomaleate salt, melting point 156°-158° C.

1. stirringThe mixture was stirred for 30 minutes
2. washwashed with cold dilute hydrochloric acid
3. dry with materialdried (MgSO4)
4. filtrationfiltered
5. concentrationconcentrated to dryness
6. dissolutionThe resulting oil was dissolved in acetonitrile
7. temperatureThe reaction mixture was heated
8. temperatureunder reflux for three days under nitrogen
9. customThe solvent was removed under reduced pressure
10. washThis solution was washed (×2) with water
11. dry with materialdried (MgSO4)
12. filtrationfiltered
13. concentrationconcentrated
14. customto dry under reduced pressure
15. customChromatography on silica gel (eluent ethyl acetate/methanol) gave an oil which
16. customthe white crystals collected