Water → 2,4-Bis-benzyloxy-5-isopropenyl-benzoic acid benzyl ester

HRID 2060104Notes

Reaction equation

HRID 2060104 reaction equation
[CH2:1]([O:8][C:9](=[O:33])[C:10]1[CH:15]=[C:14](Br)[C:13]([O:17][CH2:18][C:19]2[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=2)=[CH:12][C:11]=1[O:25][CH2:26][C:27]1[CH:32]=[CH:31][CH:30]=[CH:29][CH:28]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.C(=O)([O-])[O-].[Cs+].[Cs+].O.[CH2:41]1[CH2:45]OC[CH2:42]1>C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[CH2:1]([O:8][C:9](=[O:33])[C:10]1[CH:15]=[C:14]([C:41]([CH3:45])=[CH2:42])[C:13]([O:17][CH2:18][C:19]2[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=2)=[CH:12][C:11]=1[O:25][CH2:26][C:27]1[CH:32]=[CH:31][CH:30]=[CH:29][CH:28]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1

Participants

6

Reactant 4

HCID 962WaterHCID 8028TetrahydrofuranHCID 10796Cesium carbonateHCID 46915635Benzyl-2,4-bis-benzyloxy-5-bromobenzoate

Product 1

HCID 592631182,4-Bis-benzyloxy-5-isopropenyl-benzoic acid benzyl ester

Reagents, catalysts & solvents 1

HCID 178418397HCID 178418397, compoundCatalyst

Procedure

To a mixture of 2,4-bis-benzyloxy-5-bromo-benzoic acid benzyl ester (42.9 g, 85.7 mmol), potassium isopropenyl trifluoroborate (14.0 g, 95.2 mmol) and caesium carbonate (83.8 g, 257.1 mmol) in THF (800 mL) was added Pd(PPh3)4 (2.0 g) followed by water (150 mL). The mixture was heated at reflux for 72 h then allowed to cool to ambient. The mixture was reduced in vacuo to remove THF and then partitioned between water (500 mL) and EtOAc (300 mL). The organic portion was washed with brine, dried (MgSO4), filtered and reduced in vacuo to give the title compound (40.9 g) as a brown oil.

Workup

  1. temperatureThe mixture was heated
  2. temperatureat reflux for 72 h
  3. temperatureto cool
  4. customto remove THF
  5. custompartitioned between water (500 mL) and EtOAc (300 mL)
  6. washThe organic portion was washed with brine
  7. dry with materialdried (MgSO4)
  8. filtrationfiltered

Sources & evidence

ORD record
ord-13536b5b956947f78b5157f90d6a6300
Source dataset
uspto-grants-2012_10
Patent number
US08277807B2

Reaction notes

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