N-bromobutanimide → HCID 68297620, compound

HRID 1410970Notes

Reaction equation

HRID 1410970 reaction equation
C[O:2][C:3](=O)[CH:4]=[CH:5][C:6](=[C:11]([NH:13][C@@H:14]([C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1)[CH3:15])[CH3:12])[C:7]([O:9][CH3:10])=[O:8].C[O-].[Na+].[Br:26]N1C(=O)CCC1=O>CO>[CH3:10][O:9][C:7]([C:6]1[CH:5]=[C:4]([Br:26])[C:3](=[O:2])[N:13]([C@@H:14]([C:16]2[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=2)[CH3:15])[C:11]=1[CH3:12])=[O:8]

Participants

5

Reactant 3

HCID 67184N-bromobutanimideHCID 10942334Sodium MethoxideHCID 86714161HCID 86714161, compound

Product 1

HCID 68297620HCID 68297620, compoundYield 51.8%

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

MeOH (170 mL) was added to a flask containing (R)-4-[1-(1-phenyl-ethylamino)-ethylidene]-pent-2-enedioic acid dimethyl ester (5.56 g, 18.3 mmol). NaOMe solution (4.2 mL, 18.3 mmol, 4.375 M in MeOH) and N-bromosuccinimide (3.92 g, 22 mmol) were added, and the resulting mixture was refluxed for 7 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 (0-25% EtOAc/hexanes) to give 3.32 g of the title compound as an off-white solid. MS: (+) m/z 372.20, 374.16 (M+Na, 79/81Br).

Workup

  1. temperaturethe resulting mixture was refluxed for 7 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 (0-25% EtOAc/hexanes)

Sources & evidence

ORD record
ord-4db29750e620474991b83816cbdc5b49
Source dataset
uspto-grants-2014_12
Patent number
US08921389B2

Reaction notes

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