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Ethanol → (3r)-3-t-Butyldiphenylsilyloxy-1-(4-ethoxycarbonyl-1,3-thiazol-2-yl)pyrrolidine

HRID 891578
Notizen
Druckvorschau

Reaktionsgleichung

Reaktionsgleichung von HRID 891578
[CH2:1]([O:3][C:4]([C:6]1[N:7]=[C:8]([N:11]2[CH2:15][CH2:14][C@@H:13]([OH:16])[CH2:12]2)[S:9][CH:10]=1)=[O:5])[CH3:2].[Si:17](Cl)([C:30]([CH3:33])([CH3:32])[CH3:31])([C:24]1[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=1)[C:18]1[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1.N1C=CN=C1.C(O)C>CN(C)C=O>[Si:17]([O:16][C@@H:13]1[CH2:14][CH2:15][N:11]([C:8]2[S:9][CH:10]=[C:6]([C:4]([O:3][CH2:1][CH3:2])=[O:5])[N:7]=2)[CH2:12]1)([C:30]([CH3:33])([CH3:32])[CH3:31])([C:24]1[CH:25]=[CH:26][CH:27]=[CH:28][CH:29]=1)[C:18]1[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1
KomponentenVersuchsvorschriftAufarbeitungQuellen und NachweiseNotizen zur Reaktion

Komponenten

6

Edukt 4

HCID 702EthanolHCID 795ImidazoleHCID 94078tert-ButyldiphenylchlorosilaneHCID 69544049HCID 69544049, Verbindung

Produkt 1

HCID 69544224(3r)-3-t-Butyldiphenylsilyloxy-1-(4-ethoxycarbonyl-1,3-thiazol-2-yl)pyrrolidineAusbeute 98,1 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 6228
Dimethylformamide
Lösungsmittel

Versuchsvorschrift

To a solution of (3R)-1-(4-ethoxycarbonyl-1,3-thiazol-2-yl)-3-hydroxypyrrolidine (3.0 g, 12.4 mmol) (obtained as described in Reference Example 18(2)) in dimethylformamide (90 ml) were added t-butyldiphenylsilyl chloride (6.45 ml, 24.8 mmol) and imidazole (1.69 g, 24.8 mmol) in an ice bath. After stirring the mixture in an ice bath for 10 minutes, the resulting mixture was stirred at room temperature overnight. After checking the completion of the reaction, ethanol (2.59 ml) was added to the reaction mixture in an ice bath and the resulting mixture was stirred at room temperature for 2 hours. The reaction mixture was partitioned between ethyl acetate and 10% aqueous sodium chloride solution. The organic layer was washed successively with saturated aqueous sodium hydrogencarbonate solution and saturated aqueous sodium chloride solution, dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The residue was purified by chromatography on a silica gel column using n-hexane:ethyl acetate (4:1→1:1) as the eluant to afford (3R)-3-t-butyldiphenylsilyloxy-1-(4-ethoxycarbonyl-1,3-thiazol-2-yl)pyrrolidine (5.85 g, yield 90%) as a pale brown solid.

Aufarbeitung

  1. stirringthe resulting mixture was stirred at room temperature overnight
  2. additionwas added to the reaction mixture in an ice bath
  3. stirringthe resulting mixture was stirred at room temperature for 2 hours
  4. customThe reaction mixture was partitioned between ethyl acetate and 10% aqueous sodium chloride solution
  5. washThe organic layer was washed successively with saturated aqueous sodium hydrogencarbonate solution and saturated aqueous sodium chloride solution
  6. dry with materialdried over anhydrous sodium sulfate
  7. filtrationfiltered
  8. concentrationconcentrated under reduced pressure
  9. customThe residue was purified by chromatography on a silica gel column

Quellen und Nachweise

ORD-Eintrag
ord-4cd66f233936459988d4ae5a7332649f
Quelldatensatz
uspto-grants-2006_02
DOI
10.6084/m9.figshare.5104873.v1
Patentnummer
US07001897B2

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