Imidazole → (S)-2-(tert-Butyldimethylsilyloxy)-g-butyrolactone

HRID 1917512

Reaktionsgleichung

Reaktionsgleichung von HRID 1917512
[OH:1][C@H:2]1[CH2:6][CH2:5][O:4][C:3]1=[O:7].N1C=CN=C1.[Si:13](Cl)([C:16]([CH3:19])([CH3:18])[CH3:17])([CH3:15])[CH3:14]>CN(C=O)C.C(OCC)C>[Si:13]([O:1][C@H:2]1[CH2:6][CH2:5][O:4][C:3]1=[O:7])([C:16]([CH3:19])([CH3:18])[CH3:17])([CH3:15])[CH3:14]

Komponenten

6

Edukt 3

HCID 795ImidazoleHCID 28928tert-Butyldimethylsilyl chlorideHCID 3578532-Hydroxy-gamma-butyrolactone, (2S)-

Produkt 1

HCID 10965951(S)-2-(tert-Butyldimethylsilyloxy)-g-butyrolactoneAusbeute 100 %

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 3283Diethyl EtherLösungsmittelHCID 6228DimethylformamideLösungsmittel

Versuchsvorschrift

To a solution of (S)-3-hydroxydihydrofuran-2(3H)-one (91a, 5 g, 49 mmol) in anhydrous DMF (40 mL) was added imidazole (6.7 g, 98 mmol) and TBDMS-chloride (8.1 g, 54 mmol) and the reaction is stirred for 3 h. The reaction was diluted with diethyl ether and washed with 1N HCl×3. The organic phase was dried over anhydrous sodium sulfate and the solvent was removed in vacuo to yield (S)-3-(tert-butyldimethylsilyloxy)dihydrofuran-2(3H)-one (91b) as a clear oil (10.6 g, 49 mmol). 1H NMR (400 MHz, CHLOROFORM-d) δ 0.15 (s, 3H), 0.18 (s, 3H), 0.86-0.99 (m, 9H), 2.23 (dq, J=12.63, 8.67 Hz, 1H), 2.46 (dddd, J=12.63, 7.58, 6.57, 3.28 Hz, 1H), 2.84-3.01 (m, 1H), 4.20 (td, J=9.16, 6.44 Hz, 1H), 4.33-4.47 (m, 2H).

Aufarbeitung

  1. washwashed with 1N HCl×3
  2. dry with materialThe organic phase was dried over anhydrous sodium sulfate
  3. customthe solvent was removed in vacuo

Quellen und Nachweise

ORD-Eintrag
ord-ab90da5a25684382ab25b43fe95284a8
Quelldatensatz
uspto-grants-2013_12
Patentnummer
US08618290B2

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