N-bromobutanimide → 4-Bromo-7-hydroxy-2-phenyl-thiazolo[5,4-c]pyridine-6-carboxylic acid ethyl ester

HRID 642353Notes

Reaction equation

HRID 642353 reaction equation
[CH2:1]([O:3][C:4]([C:6]1[N:11]=[CH:10][C:9]2[S:12][C:13]([C:15]3[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=3)=[N:14][C:8]=2[C:7]=1[OH:21])=[O:5])[CH3:2].[Br:22]N1C(=O)CCC1=O>C(Cl)(Cl)(Cl)Cl.C(OOC(=O)C1C=CC=CC=1)(=O)C1C=CC=CC=1>[CH2:1]([O:3][C:4]([C:6]1[N:11]=[C:10]([Br:22])[C:9]2[S:12][C:13]([C:15]3[CH:16]=[CH:17][CH:18]=[CH:19][CH:20]=3)=[N:14][C:8]=2[C:7]=1[OH:21])=[O:5])[CH3:2]

Participants

5

Reactant 2

HCID 67184N-bromobutanimideHCID 684268667-Hydroxy-2-phenyl-thiazolo[5,4-c]pyridine-6-carboxylic acid ethyl ester

Product 1

HCID 866173574-Bromo-7-hydroxy-2-phenyl-thiazolo[5,4-c]pyridine-6-carboxylic acid ethyl esterYield 71.1%

Reagents, catalysts & solvents 2

HCID 7187Benzoyl PeroxideCatalystHCID 5943Carbon TetrachlorideSolvent

Procedure

A mixture of 7-hydroxy-2-phenyl-thiazolo[5,4-c]pyridine-6-carboxylic acid ethyl ester (2.10 g, 7.01 mmole), N-bromosuccinimide (1.31 g, 7.36 mmole) and benzoyl peroxide (84.9 mg, 0.35 mmole) in carbon tetrachloride (40 ml) was refluxed for 2 h before it was cooled to room temperature and partitioned between dichloromethane and water. The organic layer was washed with saturated aqueous sodium bicarbonate solution, brine, dried over anhydrous sodium sulfate and concentrated in vacuo. The residue was purified by flash column chromatography on silica gel with a gradient of ethyl acetate and dichloromethane to give the title compound as a white solid (1.89 g). MS: (+) m/z 379.18, 381.18 (M+1, 79Br/81Br).

Workup

  1. temperaturewas refluxed for 2 h before it
  2. custompartitioned between dichloromethane and water
  3. washThe organic layer was washed with saturated aqueous sodium bicarbonate solution, brine
  4. dry with materialdried over anhydrous sodium sulfate
  5. concentrationconcentrated in vacuo
  6. customThe residue was purified by flash column chromatography on silica gel with a gradient of ethyl acetate and dichloromethane

Sources & evidence

ORD record
ord-3663eb51409d4d75b56112ff17353f86
Source dataset
uspto-grants-2010_04
Patent number
US07696223B2

Reaction notes

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