Reaktion #1885042

Reaktionsgleichung

(R)-3-hydroxydihydrofuran-2(3H)-one

imidazole

t-butyldiphenylsilyl chloride

→

(R)-3-(tert-butyldiphenylsilyloxy)dihydrofuran-2(3H)-one

Ausbeute 93.0%

Lösungsmittel

CH2Cl2

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeThe mixture was partitioned between CH2Cl2 (700 mL) and H2O (100 mL)
2. 2
   EinengenThe organic portion was concentrated to dryness under reduced pressure
3. 3
   SonstigeThe residue was purified by silica gel chromatography (50% EtOAc in hexane)

Vorschrift

To a stirred solution of (R)-3-hydroxydihydrofuran-2(3H)-one (41.0 g, 401 mmol), imidazole (61.4 g, 920 mmol), and CH2Cl2 (175 mL) at 0° C., under N2, was added t-butyldiphenylsilyl chloride (129 mL, 138 g, 497 mmol) dropwise over 30 minutes. The mixture was stirred at room temperature for 19 hours. The mixture was partitioned between CH2Cl2 (700 mL) and H2O (100 mL). The organic portion was concentrated to dryness under reduced pressure. The residue was purified by silica gel chromatography (50% EtOAc in hexane) to afford (R)-3-(tert-butyldiphenylsilyloxy)dihydrofuran-2(3H)-one (127 g, 373 mmol, 93% yield) as a white solid. 1H-NMR (400 MHz, CDCl3) δ 7.84-7.82 (m, 2H), 7.73-7.71 (m, 2H), 7.50-7.40 (m, 6H), 4.41-4.31 (m, 2H), 4.06-4.00 (m, 1H), 2.29-2.19 (m, 2H), 1.10 (s, 9H).

Quelle