The 1-[3-[(1,1-dimethylethyl)dimethylsiloxy]phenyl]-2-[(dimethylamino)methylene]-2-(4,5-diphenyl-2-oxazolyl)ethanone (19) (10.3 g, 19.6 mmol) was dissolved in THF (100 mL) and tetra-n-butyl ammonium fluoride (17.5 mL of 1M in THF) was added dropwise. The reaction mixture was stirred for about 1/4 hour and poured onto an ether (180 mL)/1N HCl(20 mL) solution, and the organic phase separated and dried (MgSO4). Chromatography (elution with 75% ethyl acetate/hexanes) gave the phenol 7.7 g (96%). IR (KBr, cm-1) 3170, 3060, 2920, 1735, 1635, 1600, 1447, 1375, 1310, 1210, 1010, 965, 870, 765, 695. 1H NMR (300 MHz, CDCl3) δ 2.6 to 3.1 (6H, Series of Br. s) 6.84 (1H, Br.s), 6.95 (1H, Br. s), 7.04 to 7.24 (10H, m), 7.32 to 7.60 (5H, m). m/e 411 (MH+)
