Benzyl Bromide → Benzyl 4-(4-bromophenyl)-4-oxobutanoate

HRID 2035378Notes

Reaction equation

HRID 2035378 reaction equation
[CH2:1](Br)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[Br:9][C:10]1[CH:15]=[CH:14][C:13]([C:16](=[O:22])[CH2:17][CH2:18][C:19]([OH:21])=[O:20])=[CH:12][CH:11]=1.C([O-])([O-])=O.[K+].[K+]>CN(C=O)C>[Br:9][C:10]1[CH:11]=[CH:12][C:13]([C:16](=[O:22])[CH2:17][CH2:18][C:19]([O:21][CH2:1][C:2]2[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=2)=[O:20])=[CH:14][CH:15]=1

Participants

5

Reactant 3

HCID 7498Benzyl BromideHCID 11430Potassium CarbonateHCID 806463-(4-Bromobenzoyl)propionic acid

Product 1

HCID 57610959Benzyl 4-(4-bromophenyl)-4-oxobutanoateYield 79%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

Benzyl bromide (9.98 g, 58.3 mmol) was added to a solution of 4-(4-bromophenyl)-4-oxobutanoic acid (15.0 g, 58.3 mmol) and K2CO3 (3.5 g, 58.3 mmol) in DMF (300 mL) and stirred for 18 hours. The reaction mixture was partitioned between water (200 mL) and ethyl acetate (500 mL). Sat'd NaHCO3 soln (20 mL) was added and the aqueous layer extracted with ethyl acetate (2×) and the combined organic layers were washed with brine and dried and filtered. Concentration gave Example J5, benzyl 4-(4-bromophenyl)-4-oxobutanoate 16 g (79%) which was used without further purification. 1H NMR (500 MHz, CDCl3) δ 7.83 (d, J=8.6 Hz, 2H), 7.61 (d, J=8.5 Hz, 2H), 7.35-7.34 (m, 5H), 5.14 (s, 2H), 3.27 (t, J=6.7 Hz, 2H), 2.81 (t, J=6.7 Hz, 2H). HRMS: Anal. C17H16BrNO3 Calcd. 347.0277; found: 347.0283 (M+H)+.

Workup

  1. customThe reaction mixture was partitioned between water (200 mL) and ethyl acetate (500 mL)
  2. additionSat'd NaHCO3 soln (20 mL) was added
  3. extractionthe aqueous layer extracted with ethyl acetate (2×)
  4. washthe combined organic layers were washed with brine
  5. customdried
  6. filtrationfiltered
  7. concentrationConcentration

Sources & evidence

ORD record
ord-e365a5a625804c41b05880581c59a2e7
Source dataset
uspto-grants-2013_11
Patent number
US08574563B2

Reaction notes

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