Potassium Carbonate → l0-bromo-2-t-butoxycarbonylmethyloxy-5-methyl-4H-pyrido[3,2,1-jk]carbazole-4-one

10-bromo-2-hydroxy-5-methyl-4H-pyrido[3,2,1-jk]carbazole-4-one (250 mg) obtained in Example 49 was suspended in dimethyl sulfoxide (10 ml), and potassium carbonate (210 mg) was added to the suspension. The mixture was stirred at room temperature for 30 minutes and t-butyl bromoacetate (0.13 ml) was added to the mixture. The mixture was stirred for 2.5 hours at room temperature, and the reaction mixture was poured into ice water (50 ml) and extracted with ethyl acetate. The ethyl acetate layer was washed with saturated aqueous solution of sodium chloride, and dried over anhydrous sodium sulfate, and the solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (eluent: methylene chloride containing 2% methanol), and the crude purification product was washed with ether and recovered by filtration to obtain the title compound (130 mg, 39%).

1. stirringThe mixture was stirred for 2.5 hours at room temperature
2. extractionextracted with ethyl acetate
3. washThe ethyl acetate layer was washed with saturated aqueous solution of sodium chloride
4. dry with materialdried over anhydrous sodium sulfate
5. customthe solvent was evaporated under reduced pressure
6. customThe residue was purified by silica gel column chromatography (eluent: methylene chloride containing 2% methanol)
7. customthe crude purification product
8. washwas washed with ether
9. filtrationrecovered by filtration

ORD-Eintrag

ord-426c7bb4e6e9438ba8a63a43f857d463

Quelldatensatz

uspto-grants-2000_01

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06018046