Oxygen → Perhydroxyl radical

HRID 1065207

Reaktionsgleichung

Reaktionsgleichung von HRID 1065207
CC([C@@H]1[C@@]2(C)CC[C@@H]3[C@]4(C)C(=CC(CC4)=O)CC[C@H]3[C@@H]2CC1)=[O:3].[CH3:24][C:25]([C@:27]1([OH:47])[C@@:31]2([CH3:46])[CH2:32][CH2:33][C@@H:34]3[C@:44]4([CH3:45])[C:38](=[CH:39][C:40]([CH2:42][CH2:43]4)=[O:41])[CH2:37][CH2:36][C@H:35]3[C@@H:30]2[CH2:29][CH2:28]1)=[O:26].C(OC1CC[C@@]2(C)C(=CC[C@@H]3[C@@H]2CC[C@@]2(C)[C@H]3CC[C@@H]2C(=O)C)C=1)C.[O:73]=[O:74].[K]>O1CCCC1.CN(C)C=O.C(O)(C)(C)C>[O-:73][OH:74].[CH3:24][C:25]([C@:27]1([O:47][OH:3])[C@@:31]2([CH3:46])[CH2:32][CH2:33][C@@H:34]3[C@:44]4([CH3:45])[C:38](=[CH:39][C:40]([CH2:42][CH2:43]4)=[O:41])[CH2:37][CH2:36][C@H:35]3[C@@H:30]2[CH2:29][CH2:28]1)=[O:26]

Komponenten

10

Edukt 5

HCID 977OxygenHCID 5994ProgesteroneHCID 623817-HydroxyprogesteroneHCID 5462222PotassiumHCID 53756045HCID 53756045, Verbindung

Produkt 2

HCID 18500Perhydroxyl radicalHCID 15297717alpha-Hydroperoxyprogesterone

Reagenzien, Katalysatoren, Lösungsmittel 3

HCID 6228DimethylformamideLösungsmittelHCID 6386tert-ButanolLösungsmittelHCID 8028TetrahydrofuranLösungsmittel

Versuchsvorschrift

The direct introduction of a hydroxyl group at the 17 position of progesterone, protected as its Δ3,5 methyl enol ether, would be a valuable process for the synthesis of 17α-hydroxyprogesterone, and could be readily adapted to other corticosteroid intermediates. Unfortunately, this oxidation has heretofore been a poor process. D. Barton [J. Chem. Soc., 1578(1962)] developed a method for the hydroperoxylation of the 17(20)-enolate of 3-ethoxypregna-3,5-dien-20-one using oxygen and potassium and tert-butyl alcohol, dimethylformamide (DMF), and tetrahydrofuran (THF). The intermediate hydroperoxide was isolated in 30% yield and hydrolyzed to 17α-hydroperoxyprogesterone in 75% yield. This process was ultimately improved when J. Garnder [J. Org. Chem., 33, 3294(1968)] found that the addition of trialkylphosphites reduced the intermediate hydroperoxide to the alcohol in situ and was stable to the reaction conditions. Gardner used his modifications of the Barton procedure to oxygenate pregnen-20-ones to their 17α-hydroxy compounds; in a similar fashion, pregnan-20-ones, were converted in yields between 60-70 %.

Quellen und Nachweise

ORD-Eintrag
ord-1b9133fb2ea648afbbcac32ba201a661
Quelldatensatz
uspto-grants-1982_05
Patentnummer
US04329294

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