Sulfuric Acid → 5-Chloro-2-(ethoxycarbonyl)-1-(phenylsulfonyl)-1H-indole-3-sulfonic acid

HRID 1676970Notes

Reaction equation

HRID 1676970 reaction equation
[Cl:1][C:2]1[CH:3]=[C:4]2[C:8](=[CH:9][CH:10]=1)[N:7]([S:11]([C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1)(=[O:13])=[O:12])[C:6]([C:20]([O:22][CH2:23][CH3:24])=[O:21])=[CH:5]2.C(OC(=O)C)(=O)C.[S:32](=O)(=[O:35])([OH:34])[OH:33]>ClCCl>[Cl:1][C:2]1[CH:3]=[C:4]2[C:8](=[CH:9][CH:10]=1)[N:7]([S:11]([C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1)(=[O:13])=[O:12])[C:6]([C:20]([O:22][CH2:23][CH3:24])=[O:21])=[C:5]2[S:32]([OH:35])(=[O:34])=[O:33]

Participants

5

Reactant 3

HCID 1118Sulfuric AcidHCID 7918Acetic AnhydrideHCID 22401489ethyl 5-chloro-1-(phenylsulfonyl)-1H-indole-2-carboxylate

Product 1

HCID 224015045-Chloro-2-(ethoxycarbonyl)-1-(phenylsulfonyl)-1H-indole-3-sulfonic acid

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

To a solution of ethyl 5-chloro-1-(phenylsulfonyl)-1H-indole-2-carboxylate (5.56 g, 15.3 mmol) in 50 mL of dichloromethane at 0° C. was added acetic anhydride (7.23 mL, 76.6 mmol), followed by dropwise addition of concentrated sulfuric acid. The solution was warmed to room temperature, stirred for 3 hours, and partitioned between 0.5 L of EtOAc and 0.5 L of 3N HCl solution. The organic phase was washed with brine, dried with Na2SO4, filtered, and concentrated in vacuo. The product was reconcentrated from benzene in vacuo to give the titled product as a yellow solid. Proton NMR for the product was consistent with the titled compound of the formula C17H14ClNO7S2.0.5 CH3CO2H. ESI+MS: 444.0 [M+H+, 466.0 [M+Na]+.

Workup

  1. custompartitioned between 0.5 L of EtOAc and 0.5 L of 3N HCl solution
  2. washThe organic phase was washed with brine
  3. dry with materialdried with Na2SO4
  4. filtrationfiltered
  5. concentrationconcentrated in vacuo

Sources & evidence

ORD record
ord-eb67018aff9842e78739726c3f13c314
Source dataset
uspto-grants-2011_08
Patent number
US08008295B2

Reaction notes

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