Potassium Carbonate → 10-bromo-2-(3-carboxy-1-trans-propenyloxy)-5-(3-pyridylmethyl)-4H-pyrido[3,2,1-jk]carbazole-4-one

HRID 850742Notes

Reaction equation

HRID 850742 reaction equation
[Br:1][C:2]1[CH:3]=[CH:4][C:5]2[N:6]3[CH:18]=[C:17]([CH2:19][C:20]4[CH:21]=[N:22][CH:23]=[CH:24][CH:25]=4)[C:16](=[O:26])[C:8]4[CH:9]=[C:10]([OH:15])[CH:11]=[C:12]([C:13]=2[CH:14]=1)[C:7]3=4.C(=O)([O-])[O-].[K+].[K+].Br[CH2:34]/[CH:35]=[CH:36]/[C:37]([O:39]CC)=[O:38]>CS(C)=O>[Br:1][C:2]1[CH:3]=[CH:4][C:5]2[N:6]3[CH:18]=[C:17]([CH2:19][C:20]4[CH:21]=[N:22][CH:23]=[CH:24][CH:25]=4)[C:16](=[O:26])[C:8]4[CH:9]=[C:10]([O:15]/[CH:34]=[CH:35]/[CH2:36][C:37]([OH:39])=[O:38])[CH:11]=[C:12]([C:13]=2[CH:14]=1)[C:7]3=4

Participants

5

Reactant 3

HCID 11430Potassium CarbonateHCID 5373944Ethyl (E)-4-bromobut-2-enoateHCID 1588691010-bromo-2-hydroxy-5-(3-pyridylmethyl)-4H-pyrido[3,2,1-jk]carbazole-4-one

Product 1

HCID 1588692410-bromo-2-(3-carboxy-1-trans-propenyloxy)-5-(3-pyridylmethyl)-4H-pyrido[3,2,1-jk]carbazole-4-oneYield 10%

Reagents, catalysts & solvents 1

HCID 679Dimethyl SulfoxideSolvent

Procedure

10-bromo-2-hydroxy-5-(3-pyridylmethyl)-4H-pyrido[3,2,1-jk]carbazole-4-one (400 mg) obtained in Example 2 was suspended in dimethyl sulfoxide (30 ml), and to the suspension was added potassium carbonate (0.3 g), and the mixture was stirred at room temperature for 30 minutes. Ethyl 4-bromocrotonate (0.15 ml) was added and the mixture was stirred at room temperature for 12 hours. The reaction mixture was poured into ice water (300 ml), and extracted with ethyl acetate. The ethyl acetate layer was washed with saturated aqueous solution of sodium chloride, dried over anhydrous sodium sulfate, and the solvent was evaporated under reduced pressure. The residue was purified by silica gel flash column chromatography (eluent: ethyl acetate). The resulting crude crystals were suspended in ethanol (20 ml), and 1N aqueous solution of sodium hydroxide (5 ml) was added to the suspension followed by stirring at room temperature for 12 hours. The solvent was evaporated under reduced pressure and the residue was extracted with water and ethyl acetate. 1N hydrochloric acid was added to the aqueous layer to a pH of 7, and the precipitated crystals were recovered by filtration to obtain the title compound (50 mg, 10%).

Workup

  1. stirringthe mixture was stirred at room temperature for 12 hours
  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 flash column chromatography (eluent: ethyl acetate)
  7. addition1N aqueous solution of sodium hydroxide (5 ml) was added to the suspension
  8. stirringby stirring at room temperature for 12 hours
  9. customThe solvent was evaporated under reduced pressure
  10. extractionthe residue was extracted with water and ethyl acetate
  11. addition1N hydrochloric acid was added to the aqueous layer to a pH of 7
  12. filtrationthe precipitated crystals were recovered by filtration

Sources & evidence

ORD record
ord-7c91dae632054bb39ae8c57bdbed994f
Source dataset
uspto-grants-2000_01
Patent number
US06018046

Reaction notes

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