Hydrochloric Acid → 1-Hydroxy-1-(4,5-diphenyloxazol-2-yl)-2-(3-methoxybenzyl)cyclopentane

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Reaktionsgleichung

[C:1]1([C:7]2[N:8]=[CH:9][O:10][C:11]=2[C:12]2[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=2)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.C([Li])CCC.[CH3:23][O:24][C:25]1[CH:26]=[C:27]([CH:35]=[CH:36][CH:37]=1)[CH2:28][CH:29]1[CH2:33][CH2:32][CH2:31][C:30]1=[O:34].Cl>O1CCCC1.C(OCC)(=O)C>[OH:34][C:30]1([C:9]2[O:10][C:11]([C:12]3[CH:13]=[CH:14][CH:15]=[CH:16][CH:17]=3)=[C:7]([C:1]3[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=3)[N:8]=2)[CH2:31][CH2:32][CH2:33][CH:29]1[CH2:28][C:27]1[CH:35]=[CH:36][CH:37]=[C:25]([O:24][CH3:23])[CH:26]=1

Komponenten

Reaktionsbedingungen

Temperatur: 0 °C

Versuchsvorschrift

To a solution of 4,5-diphenyloxazole in tetrahydrofuran (100 ml) at -78° C. under nitrogen was added n-butyllithium (in hexane, 1,7N, 12 ml). After 30 minutes, at the same temperature a solution of 2-(3-methoxybenzyl)cyclopentanone (3.8 g) in tetrahydrofuran (10 ml) was added dropwise thereto. After being stirred for 1 hour at 0° C., the reaction mixture was poured into a mixture of ethyl acetate (200 ml) and 1N-hydrochloric acid (50 ml). The organic layer was washed with saturated sodium bicarbonate aqueous solution and brine, dried over magnesium sulfate, and evaporated in vacuo. The oily residue was chromatographed (n-hexane--ethyl acetate:5:1-2:1) on silica gel to afford 1-hydroxy-1-(4,5-diphenyloxazol-2-yl)-2-(3-methoxybenzyl)cyclopentane (8.0 g).

Aufarbeitung

washThe organic layer was washed with saturated sodium bicarbonate aqueous solution and brine
dry with materialdried over magnesium sulfate
customevaporated in vacuo
customThe oily residue was chromatographed (n-hexane--ethyl acetate:5:1-2:1) on silica gel

Quellen und Nachweise

ORD-Eintrag: ord-ba5a9907b0fd41f2aa07702cd82f2860
Quelldatensatz: uspto-grants-2000_02
DOI: 10.6084/m9.figshare.5104873.v1
Patentnummer: US06025375

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