Potassium Carbonate → 9-[(3-pyridyl)methyl]-5-carbomethoxy-1,2-dihydrocarbazol-4(3H)-one

HRID 51438

Reaction equation

HRID 51438 reaction equation
[C:1]([C:5]1[CH:17]=[CH:16][CH:15]=[C:14]2[C:6]=1[C:7]1[C:8](=[O:18])[CH2:9][CH2:10][CH2:11][C:12]=1[NH:13]2)([O:3][CH3:4])=[O:2].C(=O)([O-])[O-].[K+].[K+].Cl.[N:26]1[CH:31]=[CH:30][CH:29]=[C:28]([CH2:32]Cl)[CH:27]=1>[I-].[Na+].O>[N:26]1[CH:31]=[CH:30][CH:29]=[C:28]([CH2:32][N:13]2[C:12]3[CH2:11][CH2:10][CH2:9][C:8](=[O:18])[C:7]=3[C:6]3[C:14]2=[CH:15][CH:16]=[CH:17][C:5]=3[C:1]([O:3][CH3:4])=[O:2])[CH:27]=1

Participants

6

Reactant 3

HCID 11430Potassium CarbonateHCID 233943-(Chloromethyl)pyridine hydrochlorideHCID 11368514methyl 4-oxo-2,3,4,9-tetrahydro-1H-carbazole-5-carboxylate

Product 1

HCID 227390619-[(3-pyridyl)methyl]-5-carbomethoxy-1,2-dihydrocarbazol-4(3H)-oneYield 80%

Reagents, catalysts & solvents 2

HCID 5238Sodium IodideCatalystHCID 962WaterSolvent

Procedure

A suspension of 5-carbomethoxy-1,2-dihydro-9H-carbazol-4(3H)-one (500 mg, 2.06 mmol), potassium carbonate (860 mg, 18.8 mmol), and catalytic amount of sodium iodide (ca. 10 mg), was treated with 3-picolyl chloride hydrochloride (500 mg, 3.05 mmol). The reaction was stirred at ambient temperature 19.5 hours. The mixture was poured into H2O (100 mL) and the mixture extracted four times with ethyl acetate. The combined organic layers were washed four times with H2O, once with saturated brine, dried over anhydrous sodium sulfate, filtered, and concentrated. The residue was purified by flash chromatography on silica gel (elution with 5% MeOH in EtOAc) to afford 550 mg (80%) of the 9-[(3-pyridyl)methyl]-5-carbomethoxy-1,2-dihydrocarbazol-4(3H)-one as a white solid. 1H NMR (CDCl3) δ8.48 (d, 1H, J=2.9 Hz), 8.43 (br s, 1H), 7.31 (d, 1H, J=7.3 Hz), 7.25-7.09 (m, 5H), 5.29 (s, 2H), 3.97 (s, 3H), 2.80 (t, 2H, J=6.1 Hz), 2.49 (t, 2H, J=6.4 Hz), and 2.20-2.12 (m, 2H). IR (CDCl3, cm−1) 1726, 1656, 1464, 1444, 1434, 1289 and 1119. MS (ES) m/e 335 (M+1).

Workup

  1. extractionthe mixture extracted four times with ethyl acetate
  2. washThe combined organic layers were washed four times with H2O
  3. dry with materialonce with saturated brine, dried over anhydrous sodium sulfate
  4. filtrationfiltered
  5. concentrationconcentrated
  6. customThe residue was purified by flash chromatography on silica gel (elution with 5% MeOH in EtOAc)

Sources & evidence

ORD record
ord-77431efe05884e288f8848171e898748
Source dataset
uspto-grants-2004_03
Patent number
US06713645B1

Linked notes

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