Water → 1-Hydroxy-1-ethoxycarbonylmethyl-5-t-butyldiphenylsilyloxy-1,2,3,4-tetrahydronaphthalene

HRID 963723Notes

Reaction equation

HRID 963723 reaction equation
[Si:1]([O:18][C:19]1[CH:28]=[CH:27][CH:26]=[C:25]2[C:20]=1[CH2:21][CH2:22][CH2:23][C:24]2=[O:29])([C:14]([CH3:17])([CH3:16])[CH3:15])([C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[C:30]([O:33][CH2:34][CH3:35])(=[O:32])[CH3:31].O>O1CCCC1>[OH:29][C:24]1([CH2:31][C:30]([O:33][CH2:34][CH3:35])=[O:32])[C:25]2[C:20](=[C:19]([O:18][Si:1]([C:14]([CH3:16])([CH3:17])[CH3:15])([C:8]3[CH:9]=[CH:10][CH:11]=[CH:12][CH:13]=3)[C:2]3[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=3)[CH:28]=[CH:27][CH:26]=2)[CH2:21][CH2:22][CH2:23]1

Participants

5

Reactant 3

HCID 962WaterHCID 8857Ethyl AcetateHCID 224673025-Tert-butyldiphenylsilyloxy-1-tetralone

Product 1

HCID 544352981-Hydroxy-1-ethoxycarbonylmethyl-5-t-butyldiphenylsilyloxy-1,2,3,4-tetrahydronaphthalene

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

To a solution of diisopropylamine (17 ml) in THF (tetrahydrofuran) (210 ml) was added n-butyllithium (67 ml, 1.6N in hexane) at -78° C. under N2. The solution was stirred for 30 minutes at 0° C. and then cooled to -78° C. To the solution was added ethyl acetate (12 g) and the mixture was stirred for 30 minutes at the same temperature to give Li-enolate solution. A solution of 5-t-butyldiphenylsilyloxy-1-oxo-1,2,3,4-tetrahydronaphthalene (10 g) in THF (50 ml) was cooled to -78° C., the above Li-enolate solution (35 ml) was added, and stirred for 1 hour at the same temperature. The mixture was poured into a mixture of ethyl acetate and water. The organic layer was washed with 1N--HCl solution, sat. NaHCO3, and brine, dried over MgSO4, and evaporated in vacuo. The residue was purified by chromatography on silica gel to afford 1-hydroxy-1-ethoxycarbonylmethyl-5-t-butyldiphenylsilyloxy-1,2,3,4-tetrahydronaphthalene (8.0 g). 2.72 (2H, t, J=6.6 Hz), 2.90 (2H, t, J=8.0 Hz), 4.30 (2H, t, J=7.0 Hz), 5.78 (1H, t, J=4.4 Hz), 6.33 (1H d, J=8 Hz), 6.6-6.9 (2H, m), 7.1-7.8 (20H, m) MS m/z: 624 (M+ +1)

Workup

  1. washThe organic layer was washed with 1N
  2. dry with materialHCl solution, sat. NaHCO3, and brine, dried over MgSO4
  3. customevaporated in vacuo
  4. customThe residue was purified by chromatography on silica gel

Sources & evidence

ORD record
ord-48de2709e60e465bbf55f5d251ac3e70
Source dataset
uspto-grants-1998_06
Patent number
US05763489

Reaction notes

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