C([Si](C)(C)[O:6][CH2:7][CH:8]1[O:12][C:11]2[C:13]3[CH2:14][CH2:15][CH2:16][C:17]=3[CH:18]=[CH:19][C:10]=2[CH2:9]1)(C)(C)C.[F-].C([N+](CCCC)(CCCC)CCCC)CCC>O1CCCC1.O>[O:12]1[CH:8]([CH2:7][OH:6])[CH2:9][C:10]2[CH:19]=[CH:18][C:17]3[CH2:16][CH2:15][CH2:14][C:13]=3[C:11]1=2To a solution of (±)-tert-butyl(dimethyl)(3,6,7,8-tetrahydro-2H-indeno[4,5-b]furan-2-ylmethoxy)silane (2.93 g; 9.62 mmol) in tetrahydrofuran (100 mL) cooled to 0° C. was added tetrabutylammonium fluoride (10.6 mL, 1.0 M solution in tetrahydrofuran) and the reaction mixture was allowed to stir at room temperature for 8 h. The reaction mixture was diluted with water (200 mL) and extracted with ethyl acetate (2×150 mL). The combined organic extracts were washed with saturated aqueous sodium chloride (400 mL), dried (magnesium sulfate) and the solvent was removed in vacuo to give a crude oil. Purification by flash column chromatography (silica, ethyl acetate:hexanes 1:3) afforded 1.67 g (91%) of (±)-3,6,7,8-tetrahydro-2H-indeno[4,5-b]furan-2-ylmethanol as a colorless oil. Rf=0.63 (silica, ethyl acetate:hexanes 1:2); Anal. calcd. for C12H14O2: C, 75.76; H, 7.42. Found: C, 74.46; H, 7.44.
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