Tetrabutylammonium Fluoride → 1alpha,3beta-dihydroxy-20(S)-{(E)-(4-hydroxy-4-methyl-2-pentenyloxy)}pregna-5,7,16-triene

HRID 2304222Notes

Reaction equation

HRID 2304222 reaction equation
[Si]([O:8][C@@H:9]1[C@@:42]2([CH3:43])[C:13](=[CH:14][CH:15]=[C:16]3[C@@H:41]2[CH2:40][CH2:39][C@@:38]2([CH3:44])[C@H:17]3[CH2:18][CH:19]=[C:20]2[C@@H:21]([O:23][CH2:24]/[CH:25]=[CH:26]/[C:27]([CH3:37])([O:29][Si](CC)(CC)CC)[CH3:28])[CH3:22])[CH2:12][C@@H:11]([O:45][Si](C(C)(C)C)(C)C)[CH2:10]1)(C(C)(C)C)(C)C.[F-].C([N+](CCCC)(CCCC)CCCC)CCC>O1CCCC1>[OH:8][C@@H:9]1[C@@:42]2([CH3:43])[C:13](=[CH:14][CH:15]=[C:16]3[C@@H:41]2[CH2:40][CH2:39][C@@:38]2([CH3:44])[C@H:17]3[CH2:18][CH:19]=[C:20]2[C@@H:21]([O:23][CH2:24]/[CH:25]=[CH:26]/[C:27]([OH:29])([CH3:28])[CH3:37])[CH3:22])[CH2:12][C@@H:11]([OH:45])[CH2:10]1

Participants

4

Reactant 2

HCID 2724141Tetrabutylammonium FluorideHCID 120200591a,3beta-bis(tert-butyldimethylsilyloxy)-20(S)-{(E)-(4-methyl-4-triethylsilyloxy-2-pentenyloxy)}pregna-5,7,16-triene

Product 1

HCID 229598141alpha,3beta-dihydroxy-20(S)-{(E)-(4-hydroxy-4-methyl-2-pentenyloxy)}pregna-5,7,16-trieneYield 34.3%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent2×

Procedure

By the same procedure as in Example 9, 1a,3β-bis(tert-butyldimethylsilyloxy)-20(S)-{(E)-(4-methyl-4-triethylsilyloxy-2-pentenyloxy)}pregna-5,7,16-triene (83.0 mg, 0.108 mmol), tetrahydrofuran (3 ml) and 1M tetra-n-butylammonium fluoride solution in tetrahydrofuran (2 ml) were reacted (heating under reflux for 5.5 hours) and worked up, and then the residue was purified by preparative thin layer chromatography (0.5 mm×1, dichloromethane:ethyl acetate:ethanol=20:80:1, developed once) to give the title compound as a pale yellow oil (15.9 mg, 34%).

Workup

  1. temperature(heating under reflux for 5.5 hours)
  2. customthe residue was purified by preparative thin layer chromatography (0.5 mm×1, dichloromethane

Sources & evidence

ORD record
ord-4c0ed8a174654fa5ad331457991eee87
Source dataset
uspto-grants-2002_08
Patent number
US06433200B1

Reaction notes

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