Tetrahydrofuran → 1alpha-(tert-butyldimethylsilyloxy)-3beta-hydroxy-20(S)-(4-ethyl-4-hydroxyhexylthio)pregna-5,7,16-triene

HRID 1268499Notes

Reaction equation

HRID 1268499 reaction equation
[Si:1]([O:8][C@@H:9]1[C@@:37]2([CH3:38])[C:13](=[CH:14][CH:15]=[C:16]3[C@@H:36]2[CH2:35][CH2:34][C@@:33]2([CH3:39])[C@H:17]3[CH2:18][CH:19]=[C:20]2[C@@H:21]([S:23][C:24](OC2C=CC=CC=2)=O)[CH3:22])[CH2:12][C@@H:11]([OH:40])[CH2:10]1)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].BrC[CH2:43][CH2:44][C:45]([CH2:49][CH3:50])([OH:48])[CH2:46][CH3:47].O1CCCC1.[OH-].[K+]>CO>[Si:1]([O:8][C@@H:9]1[C@@:37]2([CH3:38])[C:13](=[CH:14][CH:15]=[C:16]3[C@@H:36]2[CH2:35][CH2:34][C@@:33]2([CH3:39])[C@H:17]3[CH2:18][CH:19]=[C:20]2[C@@H:21]([S:23][CH2:24][CH2:43][CH2:44][C:45]([CH2:49][CH3:50])([OH:48])[CH2:46][CH3:47])[CH3:22])[CH2:12][C@@H:11]([OH:40])[CH2:10]1)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:2])[CH3:3]

Participants

6

Reactant 4

HCID 8028TetrahydrofuranHCID 14797Potassium HydroxideHCID 12019512HCID 12019512, compoundHCID 124762166-Bromo-3-ethylhexan-3-ol

Product 1

HCID 120195181alpha-(tert-butyldimethylsilyloxy)-3beta-hydroxy-20(S)-(4-ethyl-4-hydroxyhexylthio)pregna-5,7,16-trieneYield 89.5%

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

Under the same conditions as in Example 3, 1α-(tert-butyldimethylsilyloxy)-3β-hydroxy-20(S)-phenoxycarbonylthiopregna-5,7,16-triene (84.3 mg, 0.145 mmol), 6-bromo-3-ethyl-3-hexanol (152 mg, 0.725 mmol), tetrahydrofuran (1 ml) and 1M KOH solution in methanol (1 ml) were reacted and worked up, and then the residue was purified by preparative thin layer chromatography (0.5 mm×2, hexane:ethyl acetate=2:1, developed twice) to give 76.4 mg of a product, which was directly used in the subsequent reaction because it was difficult to separate from 6-bromo-3-ethyl-3-hexanol.

Workup

  1. customthe residue was purified by preparative thin layer chromatography (0.5 mm×2, hexane

Sources & evidence

ORD record
ord-8d37fdc057314879a207a6804f73b69f
Source dataset
uspto-grants-2003_04
Patent number
US06555699B2

Reaction notes

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