N-bromobutanimide → 5-Bromo-1-cyclohexylmethyl-2-methyl-6-oxo-1,6-dihydro-pyridine-3-carboxylic acid methyl ester

HRID 919928Notes

Reaction equation

HRID 919928 reaction equation
C[O:2][C:3](=O)[CH:4]=[CH:5][C:6](=[C:11]([NH:13][CH2:14][CH:15]1[CH2:20][CH2:19][CH2:18][CH2:17][CH2:16]1)[CH3:12])[C:7]([O:9][CH3:10])=[O:8].C[O-].[Na+].[Br:25]N1C(=O)CCC1=O>CO>[CH3:10][O:9][C:7]([C:6]1[CH:5]=[C:4]([Br:25])[C:3](=[O:2])[N:13]([CH2:14][CH:15]2[CH2:20][CH2:19][CH2:18][CH2:17][CH2:16]2)[C:11]=1[CH3:12])=[O:8]

Participants

5

Reactant 3

HCID 67184N-bromobutanimideHCID 10942334Sodium MethoxideHCID 867141524-[1-(Cyclohexylmethyl-amino)-ethylidene]-pent-2-enedioic acid dimethyl ester

Product 1

HCID 682971425-Bromo-1-cyclohexylmethyl-2-methyl-6-oxo-1,6-dihydro-pyridine-3-carboxylic acid methyl esterYield 67.6%

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

MeOH (200 mL) was added to a flask containing 4-[1-(cyclohexylmethyl-amino)-ethylidene]-pent-2-enedioic acid dimethyl ester (6.3 g, 21.4 mmol). NaOMe solution (4.9 mL, 21.4 mmol, 4.375 M in MeOH) and N-bromosuccinimide (4.56 g, 25.6 mmol) were added, and the resulting mixture was refluxed for 1 h. After cooling to r.t., the solvent was evaporated in vacuo. Saturated NH4Cl was added, and the resulting mixture was extracted with CH2Cl2. The organic layer was dried over MgSO4 and concentrated. The crude product was chromatographed (20% EtOAc/hexanes) to give 4.95 g of the title compound. MS: (+) m/z 364.21, 366.16 (M+Na, 79/81Br).

Workup

  1. temperaturethe resulting mixture was refluxed for 1 h
  2. customthe solvent was evaporated in vacuo
  3. additionSaturated NH4Cl was added
  4. extractionthe resulting mixture was extracted with CH2Cl2
  5. dry with materialThe organic layer was dried over MgSO4
  6. concentrationconcentrated
  7. customThe crude product was chromatographed (20% EtOAc/hexanes)

Sources & evidence

ORD record
ord-74161005dcce48a686f60835c313a1b8
Source dataset
uspto-grants-2016_03
Patent number
US09271970B2

Reaction notes

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