Hydrogen Peroxide → 1alpha,3beta-bis(tert-butyldimethylsilyloxy)-20(S)-(3-hydroxy-3-methylbutyloxy)pregna-5,7,16-triene

HRID 2304201Notes

Reaction equation

HRID 2304201 reaction equation
[Si:1]([O:8][C@@H:9]1[C@@:28]2([CH3:29])[C:13](=[CH:14][CH:15]=[C:16]3[C@@H:27]2[CH2:26][CH2:25][C@@:24]2([CH3:30])[C@H:17]3[CH2:18][CH:19]=[C:20]2[C@@H:21]([OH:23])[CH3:22])[CH2:12][C@@H:11]([O:31][Si:32]([C:35]([CH3:38])([CH3:37])[CH3:36])([CH3:34])[CH3:33])[CH2:10]1)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].[H-].[Na+].Br[CH2:42][CH:43]1[O:47][C:44]1([CH3:46])[CH3:45].C([BH-](C(CC)C)C(CC)C)(CC)C.[Li+].[OH-].[Na+].OO>O1CCCC1.C(OCC)(=O)C>[Si:1]([O:8][C@@H:9]1[C@@:28]2([CH3:29])[C:13](=[CH:14][CH:15]=[C:16]3[C@@H:27]2[CH2:26][CH2:25][C@@:24]2([CH3:30])[C@H:17]3[CH2:18][CH:19]=[C:20]2[C@@H:21]([O:23][CH2:42][CH2:43][C:44]([OH:47])([CH3:46])[CH3:45])[CH3:22])[CH2:12][C@@H:11]([O:31][Si:32]([C:35]([CH3:37])([CH3:36])[CH3:38])([CH3:33])[CH3:34])[CH2:10]1)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2]

Participants

9

Reactant 6

HCID 784Hydrogen PeroxideHCID 14798Sodium HydroxideHCID 24758Sodium hydrideHCID 3611392Lithium tri-s-butylborohydrideHCID 110410611-bromo-2,3-epoxy-3-methylbutaneHCID 120200781alpha,3beta-bis(tert-butyldimethylsilyloxy)-20(S)-hydroxypregna-5,7,16-triene

Product 1

HCID 120200791alpha,3beta-bis(tert-butyldimethylsilyloxy)-20(S)-(3-hydroxy-3-methylbutyloxy)pregna-5,7,16-trieneYield 100.1%

Reagents, catalysts & solvents 2

HCID 8028TetrahydrofuranSolvent2×HCID 8857Ethyl AcetateSolvent

Procedure

After a mixed solution of 1α,3β-bis(tert-butyldimethylsilyloxy)-20(S)-hydroxypregna-5,7,16-triene (97 mg, 0.175 mmol), sodium hydride (50 mg, 2.08 mmol) and 4-bromo-2,3-epoxy-2-methylbutane (145 mg, 0.877 mmol) in tetrahydrofuran (2 ml) was heated under reflux for 12 hours, 1M lithium tri-s-butylborohydride solution in tetrahydrofuran (1.8 ml, 1.80 mmol) was added and the mixed solution was heated under reflux for 45 minutes. The reaction solution was stirred with 3N aqueous sodium hydroxide solution and 30% aqueous hydrogen peroxide at room temperature for 30 minutes, then diluted with ethyl acetate, washed with brine and dried over magnesium sulfate. The solvent was distilled off under reduced pressure and the resulting residue was purified by column chromatography (hexane:ethyl acetate=10:1) to give the title compound as a colorless oil (113 mg, 100%).

Workup

  1. temperatureunder reflux for 12 hours
  2. temperaturethe mixed solution was heated
  3. temperatureunder reflux for 45 minutes
  4. washwashed with brine
  5. dry with materialdried over magnesium sulfate
  6. distillationThe solvent was distilled off under reduced pressure
  7. customthe resulting residue was purified by column chromatography (hexane:ethyl acetate=10:1)

Sources & evidence

ORD record
ord-c126b83a27864db6be4b978fd7393fc7
Source dataset
uspto-grants-2002_08
Patent number
US06433200B1

Reaction notes

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