C[Si](C)(C)CCOC(=O)[NH:7][C:8]1[CH:13]=[CH:12][C:11]([CH2:14][C:15]2[CH:20]=[CH:19][C:18]([CH2:21][O:22][CH:23]([CH3:25])[CH3:24])=[CH:17][CH:16]=2)=[CH:10][CH:9]=1.[F-].C([N+](CCCC)(CCCC)CCCC)CCC.O1CCCC1>CS(C)=O>[CH:23]([O:22][CH2:21][C:18]1[CH:19]=[CH:20][C:15]([CH2:14][C:11]2[CH:10]=[CH:9][C:8]([NH2:7])=[CH:13][CH:12]=2)=[CH:16][CH:17]=1)([CH3:25])[CH3:24]To a solution of 4-(4-isopropoxymethylbenzyl)phenyl carbamic acid 2-trimethylsilanylethyl ester (734 mg, 1.84 mmol) in dry dimethyl sulfoxide at 20° C. under argon atmosphere was added tetra-n-butylammonium fluoride in tetrahydrofuran (5.52 mL, 5.52 mmol). After the mixture was stirred for 1 hour, the solution was partitioned between water (50 mL) and diethyl ether (50 mL). The aqueous phase was extracted with diethyl ether (2×20 mL), and the combined organic layers were washed with water and brine, dried (Mg2SO4), and evaporated in vacuo. The crude product was purified by flash chromatography to give pure 4-(4-isopropoxymethyl-benzyl)-phenylamine (405 mg, 86%) as a clear oil.
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