Methanol → 1-(2-Hydroxyethoxy)-2-(2-hydroxyethyl)-3-(tert-butyldiphenylsilyloxy)-propane

HRID 1488487Notes

Reaction equation

HRID 1488487 reaction equation
[O:1]=[O+][O-].[CH2:4]([O:7][CH2:8][CH:9]([CH2:29][CH:30]=C)[CH2:10][O:11][Si:12]([C:25]([CH3:28])([CH3:27])[CH3:26])([C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1)[C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1)C=C.N#N.[BH4-].[Na+].[CH3:36][OH:37]>C(OCC)(=O)C.CCCCCC>[OH:37][CH2:36][CH2:4][O:7][CH2:8][CH:9]([CH2:29][CH2:30][OH:1])[CH2:10][O:11][Si:12]([C:25]([CH3:28])([CH3:26])[CH3:27])([C:19]1[CH:20]=[CH:21][CH:22]=[CH:23][CH:24]=1)[C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1

Participants

7

Reactant 5

HCID 887MethanolHCID 947NitrogenHCID 24823OzoneHCID 4311764Sodium borohydrideHCID 187904481-(2-Propene-1-oxy)-2-(2-propene-1-yl)-3-(tert-butyldiphenylsilyloxy)-propane

Product 1

HCID 187904721-(2-Hydroxyethoxy)-2-(2-hydroxyethyl)-3-(tert-butyldiphenylsilyloxy)-propaneYield 72%

Reagents, catalysts & solvents 1

HCID 21226206Ethyl acetate hexaneSolvent

Procedure

Ozone was bubbled through a -78° C. methanol (500 mL) solution of diene, 1-(2-propene-1-oxy)-2-(2-propene-1-yl)-3-(tert-butyldiphenylsilyloxy)-propane, (7.41 g, 18.80 mmol). After the disappearance of the starting material (TLC, 25% ethyl acetate/hexane), the reaction mixture was purged with N2 and sodium borohydride (2.13 g, 56.30 mmol) was added. The reaction was warmed to room temperature. After 12 hours, the reaction was concentrated. The white residue was quenched with water, and extracted with ethyl acetate (100 mL×3). The combined organic phase was washed with brine, dried, and concentrated under reduced pressure to give a residue. The residue was eluted through a short silica gel column with ethyl acetate/hexane (10% to 50% ethyl acetate gradient) and evaporation of the eluting solvent gave the 1,7-diol, 1-(2-hydroxyethoxy)-2-(2-hydroxyethyl)-3-(tert-butyldiphenylsilyloxy)-propane (5.48 g, 72% yield).

Workup

  1. additionwas added
  2. concentrationthe reaction was concentrated
  3. customThe white residue was quenched with water
  4. extractionextracted with ethyl acetate (100 mL×3)
  5. washThe combined organic phase was washed with brine
  6. customdried
  7. concentrationconcentrated under reduced pressure
  8. customto give a residue
  9. washThe residue was eluted through a short silica gel column with ethyl acetate/hexane (10% to 50% ethyl acetate gradient) and evaporation of the eluting solvent

Sources & evidence

ORD record
ord-d6d3539dabed4c9b977dda3a70f6f2fe
Source dataset
uspto-grants-1997_10
Patent number
US05674862

Reaction notes

Loading…