Potassium Carbonate → 9-[(2,6-Dichlorophenyl)methyl]-5-carbomethoxy-1,2-dihydrocarbazol-4(3h)-one

HRID 51424Notes

Reaction equation

HRID 51424 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].[CH:19]1[CH:24]=[C:23]([Cl:25])[C:22]([CH2:26]Br)=[C:21]([Cl:28])[CH:20]=1.C(=O)([O-])[O-].[K+].[K+]>CN(C=O)C.C(OCC)(=O)C>[Cl:25][C:23]1[CH:24]=[CH:19][CH:20]=[C:21]([Cl:28])[C:22]=1[CH2:26][N:13]1[C:12]2[CH2:11][CH2:10][CH2:9][C:8](=[O:18])[C:7]=2[C:6]2[C:14]1=[CH:15][CH:16]=[CH:17][C:5]=2[C:1]([O:3][CH3:4])=[O:2]

Participants

6

Reactant 3

HCID 11430Potassium CarbonateHCID 301591-Bromomethyl-2,6-dichlorobenzeneHCID 11368514methyl 4-oxo-2,3,4,9-tetrahydro-1H-carbazole-5-carboxylate

Product 1

HCID 227394759-[(2,6-Dichlorophenyl)methyl]-5-carbomethoxy-1,2-dihydrocarbazol-4(3h)-oneYield 56%

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolventHCID 8857Ethyl AcetateSolvent

Procedure

A suspension of 5-carbomethoxy-1,2-dihydro-9H-carbazol-4(3H)-one (973 mg, 4.0 mM), a-bromo-2,6-dichlorotoluene (1.19 g, 4.8 mM), and potassium carbonate (553 mg, 4.0 mM) in 10 mL DMF was stirred at room temperature for 24 hours. The mixture was diluted with ethyl acetate, washed with H2O, 1 N HCl, H2O, saturated NaHCO3, H2O, and saturated brine, dried over anhydrous magnesium sulfate, filtered, concentrated. The residue was purified by column chromatography on silica gel (elution with methylene chloride/ethyl acetate) to afford 900 mg (56%) of the 9-[(2,6-dichlorophenyl)methyl]-5-carbomethoxy-1,2-dihydrocarbazol-4(3H)-one as a white foam. 1H NMR (CDCl3) δ7.4-7.2 (m, 6H), 5.6 (s, 2H), 4.0 (s, 3H), 2.9 (t, 2H, J=6 Hz), 2.55 (t, 2H, J=6 Hz), and 2.2 (m, 2H). IR (KBr, cm−1) 1725 and 1652. MS (ES) m/e 400, 402, 404.

Workup

  1. washwashed with H2O, 1 N HCl, H2O, saturated NaHCO3, H2O, and saturated brine
  2. dry with materialdried over anhydrous magnesium sulfate
  3. filtrationfiltered
  4. concentrationconcentrated
  5. customThe residue was purified by column chromatography on silica gel (elution with methylene chloride/ethyl acetate)

Sources & evidence

ORD record
ord-f8de611e94054df88fcb4dfdaca88848
Source dataset
uspto-grants-2004_03
Patent number
US06713645B1

Reaction notes

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