Sodium hydride → 1alpha,3beta-bis(tert-butyldimethylsilyloxy)-20(R)-{(E)-(4-ethyl-4-triethylsilyloxy-2-hexenyloxy)}pregna-5,7,16-triene

HRID 635041Notes

Reaction equation

HRID 635041 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]/[CH:58]=[CH:59]/[C:60]([CH2:71][CH3:72])([O:63][Si:64]([CH2:69][CH3:70])([CH2:67][CH3:68])[CH2:65][CH3:66])[CH2:61][CH3:62]>O1CCCC1>[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]/[CH:58]=[CH:59]/[C:60]([CH2:71][CH3:72])([O:63][Si:64]([CH2:69][CH3:70])([CH2:65][CH3:66])[CH2:67][CH3:68])[CH2:61][CH3:62])[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

6

Reactant 4

HCID 24758Sodium hydrideHCID 3633615-Crown-5HCID 120200831alpha,3beta-bis(tert-butyldimethylsilyloxy)-20(R)-hydroxypregna-5,7,16-trieneHCID 18544423(E)-1-bromo-4-ethyl-4-triethylsilyloxy-2-hexene

Product 1

HCID 120201061alpha,3beta-bis(tert-butyldimethylsilyloxy)-20(R)-{(E)-(4-ethyl-4-triethylsilyloxy-2-hexenyloxy)}pregna-5,7,16-trieneYield 73%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

Under the same conditions as in Example 83, 1α,3β-bis(tert-butyldimethylsilyloxy)-20(R)-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 (E)-1-bromo-4-ethyl-4-triethylsilyloxy-2-hexene (134 mg, 0.420 mmol) were reacted in tetrahydrofuran (1 ml) and worked up, and then the 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 (62.4 mg, 73%).

Workup

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

Sources & evidence

ORD record
ord-efb83157743c462f97bce44374885fad
Source dataset
uspto-grants-2001_02
Patent number
US06184398B2

Reaction notes

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