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

Beteiligte Stoffe

Reaktionsschritte

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).

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