Methanol → 5-Carboxy-3-(2,4-dichlorobenzyl)-2-methylbenzo[b]thiophene

HRID 1699854Notes

Reaction equation

HRID 1699854 reaction equation
[Cl:1][C:2]1[CH:22]=[C:21]([Cl:23])[CH:20]=[CH:19][C:3]=1[CH2:4][C:5]1[C:6]2[CH:14]=[C:13]([C:15]([O:17]C)=[O:16])[CH:12]=[CH:11][C:7]=2[S:8][C:9]=1[CH3:10].CO.[OH-].[Na+]>O1CCCC1>[C:15]([C:13]1[CH:12]=[CH:11][C:7]2[S:8][C:9]([CH3:10])=[C:5]([CH2:4][C:3]3[CH:19]=[CH:20][C:21]([Cl:23])=[CH:22][C:2]=3[Cl:1])[C:6]=2[CH:14]=1)([OH:17])=[O:16]

Participants

5

Reactant 3

HCID 887MethanolHCID 14798Sodium HydroxideHCID 223881313-(2,4-Dichlorobenzyl)-5-(methoxycarbonyl)-2-methylbenzo[b]thiophene

Product 1

HCID 223878405-Carboxy-3-(2,4-dichlorobenzyl)-2-methylbenzo[b]thiophene

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

A mixture of 3-(2,4-Dichlorobenzyl)-5-(methoxycarbonyl)-2-methylbenzo-[b]thiophene (0.52 g, 1.42 mmol), methanol (5 ml), tetrahydrofuran (5 ml) and 2 ml aqueous sodium hydroxide solution (7 ml) was refluxed under heating for 1 hr. The reaction mixture was concentrated under reduced pressure, and water was added to the residue. Then, the mixture was acidified with 3N hydrochloric acid and the precipitate was extracted from hot ethyl acetate. The organic layer was washed with saturated brine, and dried over anhydrous magnesium sulfate. The desiccant was ffitered off, and the filtrate was concentrated under reduced pressure to give the objective compound (0.45 g, 90% by two steps) as colorless crystals.

Workup

  1. temperaturewas refluxed
  2. temperatureunder heating for 1 hr
  3. concentrationThe reaction mixture was concentrated under reduced pressure, and water
  4. additionwas added to the residue
  5. extractionthe precipitate was extracted from hot ethyl acetate
  6. washThe organic layer was washed with saturated brine
  7. dry with materialdried over anhydrous magnesium sulfate
  8. concentrationthe filtrate was concentrated under reduced pressure
  9. customto give the objective compound (0.45 g, 90% by two steps) as colorless crystals

Sources & evidence

ORD record
ord-36fd64d3a8c14f61bfd76326dbd05c21
Source dataset
uspto-grants-2002_02
Patent number
US06348474B1

Reaction notes

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