[C:1]([O:5][C:6]([NH:8][CH2:9][CH2:10][CH2:11][CH2:12][C:13]1[CH:18]=[CH:17][C:16]([S:19]C(=O)N(C)C)=[CH:15][CH:14]=1)=[O:7])([CH3:4])([CH3:3])[CH3:2].[OH-].[K+]>CO.O>[C:1]([O:5][C:6](=[O:7])[NH:8][CH2:9][CH2:10][CH2:11][CH2:12][C:13]1[CH:14]=[CH:15][C:16]([SH:19])=[CH:17][CH:18]=1)([CH3:4])([CH3:2])[CH3:3]N-tert-Butoxycarbonyl-4-[4-(dimethylcarbamoylthio)phenyl]butylamine 37 (0.35 g, 1.02 mmol) was dissolved in MeOH (8 mL). KOH (0.19 g, 3.4 mmol) dissolved in water (2 ml) was added. The mixture was stirred under reflux for 6 h and cooled to room temperature. The solvent was removed under reduced pressure. The residue was dissolved in water and acidified with 5% aqueous HCl to pH ˜5. The solvent was removed again under reduced pressure and the residue was purified by flash chromatography over silica gel (hexane/ethyl acetate, 3:1, v/v) to give the desired thiophenol 38 (0.13 g, 45%) as a clear oil. 1H NMR (300 MHz, CDCl3) δ 1.43 (s, 9H), 1.49 (m, 2H) 1.59 (m, 2H), 2.57 (t, 2H), 3.12 (m, 2H), 3.38 (s, 1H), 4.47 (br s, 1H), 7.04 (d, 2H), 7.19 (d, 2H).
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