Methyl 2-(benzyloxy)-5-((1R)-2-bromo-1-{[tert-butyl(dimethyl)silyl]oxy]ethyl)benzoate → [2-(benzyloxy)-5-((1R)-2-bromo-1-{[tert-butyl(dimethyl)silyl]oxy}ethyl)phenyl]methanol

HRID 1760721Notes

Reaction equation

HRID 1760721 reaction equation
[CH2:1]([O:8][C:9]1[CH:18]=[CH:17][C:16]([C@@H:19]([O:22][Si:23]([C:26]([CH3:29])([CH3:28])[CH3:27])([CH3:25])[CH3:24])[CH2:20][Br:21])=[CH:15][C:10]=1[C:11](OC)=[O:12])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1>O1CCCC1>[CH2:1]([O:8][C:9]1[CH:18]=[CH:17][C:16]([C@@H:19]([O:22][Si:23]([C:26]([CH3:27])([CH3:28])[CH3:29])([CH3:24])[CH3:25])[CH2:20][Br:21])=[CH:15][C:10]=1[CH2:11][OH:12])[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1

Participants

3

Reactant 1

HCID 57438683Methyl 2-(benzyloxy)-5-((1R)-2-bromo-1-{[tert-butyl(dimethyl)silyl]oxy]ethyl)benzoate

Product 1

HCID 12988834[2-(benzyloxy)-5-((1R)-2-bromo-1-{[tert-butyl(dimethyl)silyl]oxy}ethyl)phenyl]methanolYield 80.2%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Conditions

Temperature
0 °C

Procedure

Borane methylsulfide complex (42.4 ml of ˜10M solution, 424 mmol) was added drop wise to a solution of methyl 2-(benzyloxy)-5-((1R)-2-bromo-1-{[tert-butyl(dimethyl) silyl]oxy}ethyl)benzoate (Preparation 21, 91.0 g) in tetrahydrofuran (1600 ml). The resulting mixture was then heated to reflux for 2 hours and then cooled to 0° C. before quenching with methanol (270 ml). The mixture was left to stir, at room temperature for 16 hours and then the solvent removed in vacuo. The residue was partitioned between dichloromethane (500 ml) and water (500 ml). The aqueous phase was separated and extracted with more dichloromethane (500 ml) and the combined organic extracts washed with saturated aqueous sodium chloride (500 ml), dried (magnesium sulphate) and the solvent removed in vacuo. The residue was purified by flash column chromatography on silica gel eluting with cyclohexane:ethyl acetate (100:0 changing to 80:20, by volume) to give the title compound (68.7 g) as a colourless oil.

Workup

  1. temperatureThe resulting mixture was then heated
  2. temperatureto reflux for 2 hours
  3. custombefore quenching with methanol (270 ml)
  4. waitThe mixture was left
  5. customthe solvent removed in vacuo
  6. customThe residue was partitioned between dichloromethane (500 ml) and water (500 ml)
  7. customThe aqueous phase was separated
  8. extractionextracted with more dichloromethane (500 ml)
  9. washthe combined organic extracts washed with saturated aqueous sodium chloride (500 ml)
  10. dry with materialdried (magnesium sulphate)
  11. customthe solvent removed in vacuo
  12. customThe residue was purified by flash column chromatography on silica gel eluting with cyclohexane:ethyl acetate (100:0 changing to 80:20, by volume)

Sources & evidence

ORD record
ord-6fe0f2ca3b3a4cc4864a51781a38b396
Source dataset
uspto-grants-2005_01
Patent number
US06844362B2

Reaction notes

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