反应详情

A solution of silyl ether 9 (325 mg, 0.51 mmol) in 1 mL of THF was stirred at 30° C. with 2 mL of 1.0M TBAF/THF in a vial for 7.5 h. TLC indicated starting material was mostly desilylated and the reaction was concentrated in vacuo. The residual crude products were taken up in 50 mL of ethyl acetate and washed sequentially with saturated aqueous ammonium chloride (50 mL), brine (50 mL), and dried over 10 g of anhydrous sodium sulfate. The mixture was filtered and concentrated in vacuo. The residual products were purified by preparative layer chromatography on 2×2 mm thick silica gel plates eluted in EtOAc (Rf=0.5). Extraction of the major band yielded 214 mg (80%) of pure diol 10 as an oil; 1H NMR (CDCl3): 1.18 (d, J=6 Hz, 3H), 1.38-1.68 (m, 11H), 1.66-2.37 (m, 9H), 2.84 (t, J=7.2 Hz, 2H), 3.47 (m, 1H), 3.79 (m, 1H), 3.86 (s, 3H), 3.98 (p, J=7.5 Hz, 1H), 4.09 (m, 2H), 4.63 (dt, J=3, 27 Hz, 2H), 5.58 (m, 2H), 6.78 (dd, J=0.6, 3.6 Hz, 1H), 7.62 (d, J=3.6 Hz, 1H).

1. concentrationthe reaction was concentrated in vacuo
2. washwashed sequentially with saturated aqueous ammonium chloride (50 mL), brine (50 mL)
3. dry with materialdried over 10 g of anhydrous sodium sulfate
4. filtrationThe mixture was filtered
5. concentrationconcentrated in vacuo
6. customThe residual products were purified by preparative layer chromatography on 2×2 mm thick silica gel plates
7. washeluted in EtOAc (Rf=0.5)
8. extractionExtraction of the major band