Sodium hydride → 1alpha,3beta-bis(tert-butyldimethylsilyloxy)-20(S)-(4-methyl-4-triethylsilyloxy-2-pentynyloxy)pregna-5,7,16-triene

HRID 2268312Notes

Reaction equation

HRID 2268312 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+].C1OCCOCCOCCOCCOC1.Br[CH2:57][C:58]#[C:59][C:60]([CH3:70])([O:62][Si:63]([CH2:68][CH3:69])([CH2:66][CH3:67])[CH2:64][CH3:65])[CH3:61]>O1CCCC1.O>[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][CH2:57][C:58]#[C:59][C:60]([CH3:61])([O:62][Si:63]([CH2:68][CH3:69])([CH2:66][CH3:67])[CH2:64][CH3:65])[CH3:70])[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

7

Reactant 4

HCID 24758Sodium hydrideHCID 3633615-Crown-5HCID 120200781alpha,3beta-bis(tert-butyldimethylsilyloxy)-20(S)-hydroxypregna-5,7,16-trieneHCID 220276611-Bromo-4-methyl-4-triethylsilyloxy-2-pentyne

Product 1

HCID 120200581alpha,3beta-bis(tert-butyldimethylsilyloxy)-20(S)-(4-methyl-4-triethylsilyloxy-2-pentynyloxy)pregna-5,7,16-trieneYield 100.1%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 8028TetrahydrofuranSolvent

Procedure

A solution of 1α,3β-bis(tert-butyldimethylsilyloxy)-20(S)-hydroxypregna-5,7,16-triene (60.0 mg, 0.107 mmol), sodium hydride (60%, 17.1 mg, 0.428 mmol), 15-crown-5 (10 μl) and 1-bromo-4-methyl-4-triethylsilyloxy-2-pentyne (109 mg, 0.375 mmol) in tetrahydrofuran (1 ml) was stirred at 60° C. for 2 hours. The solution was cooled to room temperature and then taken into water and extracted with ethyl acetate. The extract was washed with brine and dried over magnesium sulfate, and the solvent was distilled off under reduced pressure. The resulting residue was purified by preparative thin layer chromatography (0.5 mm×2, hexane:ethyl acetate=40:1, developed once) to give the title compound as a colorless oil (82.4 mg, 99%).

Workup

  1. extractionextracted with ethyl acetate
  2. washThe extract was washed with brine
  3. dry with materialdried over magnesium sulfate
  4. distillationthe solvent was distilled off under reduced pressure
  5. customThe resulting residue was purified by preparative thin layer chromatography (0.5 mm×2, hexane

Sources & evidence

ORD record
ord-a1e086e482514732a949e182744d419d
Source dataset
uspto-grants-2001_12
Patent number
US06326503B1

Reaction notes

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