[OH:1][C:2]1[CH:17]=[CH:16][C:5]([CH2:6][CH2:7][NH:8][C:9](=[O:15])[O:10][C:11]([CH3:14])([CH3:13])[CH3:12])=[CH:4][CH:3]=1.C(=O)([O-])[O-].[K+].[K+].[CH2:24](Br)[C:25]1[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=1>CN(C=O)C.O>[CH2:24]([O:1][C:2]1[CH:17]=[CH:16][C:5]([CH2:6][CH2:7][NH:8][C:9](=[O:15])[O:10][C:11]([CH3:14])([CH3:12])[CH3:13])=[CH:4][CH:3]=1)[C:25]1[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=1To a solution of 1.11 g (4.70 mmol) of tert-butyl 4-hydroxyphenethylcarbamate in 20 mL of DMF at 22° C. was added 1.3 g (9.4 mmol) of potassium carbonate and 0.700 mL (5.87 mmol) of benzyl bromide. The mixture was stirred for about 16 h at 22° C., diluted with 100 mL of water and extracted with ethyl acetate (3×75 mL). The organic layers were combined, washed with 100 mL of 1 N HCl, dried (Na2SO4), and evaporated. The residue was purified by flash chromatography on silica gel eluting with a mixture of hexane and ethyl acetate to give tert-butyl 4-(benzyloxy)phenethylcarbamate as an oil which later solidified under vacuum. Transformation of tert-butyl 4-(benzyloxy)phenethylcarbamate to tert-butyl 4-(benzyloxy)phenethyl(methyl)carbamate was accomplished in a manner analogous to Method B Step 1.
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