[CH:1](I)([CH3:3])[CH3:2].[C:5]([O:9][C:10]([NH:12][C@@H:13]([CH2:18][C:19]1[CH:24]=[CH:23][C:22]([OH:25])=[CH:21][CH:20]=1)[C:14]([O:16][CH3:17])=[O:15])=[O:11])([CH3:8])([CH3:7])[CH3:6].C(=O)([O-])[O-].[K+].[K+]>C(#N)C>[C:5]([O:9][C:10]([NH:12][C@@H:13]([CH2:18][C:19]1[CH:24]=[CH:23][C:22]([O:25][CH:1]([CH3:3])[CH3:2])=[CH:21][CH:20]=1)[C:14]([O:16][CH3:17])=[O:15])=[O:11])([CH3:8])([CH3:6])[CH3:7]Isopropyl iodide (30 uL, 0.3 mmol) was added to a mixture of methyl (2S)-2-[(tert-butoxycarbonyl)amino]-3-(4-hydroxyphenyl)propanoate (50 mg, 0.2 mmol) (Aldrich, Cat. #469106) and potassium carbonate (35 mg, 0.25 mmol) in acetonitrile (2 mL). The reaction was heated at 60° C. overnight. The reaction was partitioned between water and ethyl acetate. The organic phase was washed with saturated brine, dried over magnesium sulfate, filtered and concentrated under reduced pressure to give the crude product (S)-methyl 2-(tert-butoxycarbonylamino)-3-(4-isopropoxyphenyl)propanoate (50 mg, 90%) as a white solid. Analytical LCMS (M+H-Boc)+: m/z=238.0.
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