Lithium hydroxide, monohydrate → HCID 67368552, compound

HRID 1910924Notes

Reaction equation

HRID 1910924 reaction equation
[Br:1][C:2]1[CH:7]=[CH:6][C:5]([C:8](=[O:19])[CH2:9][N:10]2[CH:14]=[CH:13][CH:12]=[C:11]2[C:15]([O:17]C)=[O:16])=[CH:4][CH:3]=1.O.[OH-].[Li+]>C1COCC1.O.[OH-].[Na+]>[Br:1][C:2]1[CH:3]=[CH:4][C:5]([C:8](=[O:19])[CH2:9][N:10]2[CH:14]=[CH:13][CH:12]=[C:11]2[C:15]([OH:17])=[O:16])=[CH:6][CH:7]=1

Participants

6

Reactant 2

HCID 168937Lithium hydroxide, monohydrate2×HCID 13154206HCID 13154206, compound

Product 1

HCID 67368552HCID 67368552, compoundYield 144.5%

Reagents, catalysts & solvents 3

HCID 962WaterSolventHCID 8028TetrahydrofuranSolventHCID 14798Sodium HydroxideSolvent

Procedure

To a solution of crude methyl 1-[2-(4-bromophenyl)-2-oxoethyl]-1H-pyrrole-2-carboxylate (2.39 g, 2.47 mmol) in THF (30 mL) and water (20 mL) was added lithium hydroxide monohydrate (0.63 g, 15.1 mmol). The dark solution was stirred at room temperature. The outcome of the reaction was monitored by LCMS and after 1 h another portion of lithium hydroxide monohydrate (300 mg) was added to the reaction mixture. After 16 h the reaction mixture was diluted with a aqueous solution of NaOH (1M) (50 mL) then extracted with CH2Cl2 (100 mL). The pH of the aqueous fraction was adjusted to 1 with aqueous HCl (1M) and then extracted with CH2Cl2 containing 10% of propan-2-ol (3×75 mL). The organic extracts (from acidic aqueous) were combined, dried (MgSO4) and concentrated in vacuo to give crude (˜50% pure) 1-[2-(4-bromophenyl)-2-oxoethyl]-1H-pyrrole-2-carboxylic acid as a yellow solid (1.10 g, yield 72%) The crude material was used without purification.

Workup

  1. extractionthen extracted with CH2Cl2 (100 mL)
  2. extractionextracted with CH2Cl2 containing 10% of propan-2-ol (3×75 mL)
  3. dry with materialdried (MgSO4)
  4. concentrationconcentrated in vacuo

Sources & evidence

ORD record
ord-55f8cb7623c043679782e3a0dcb4fa84
Source dataset
uspto-grants-2013_12
Patent number
US08604034B2

Reaction notes

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