Trifluoroacetic acid → N-{2-[(3S)-3-amino-4-{[tert-butyl(diphenyl)silyl]oxy}butyl]phenyl}-Nalpha-(methoxycarbonyl)-beta-phenyl-L-phenylalaninamide

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Compound methyl[(2S)-1-({2-[(3S)-3-[(tert-butoxycarbonyl)amino]-4-{[tert-butyl(diphenyl)silyl]oxy}butyl]phenyl}amino)-1-oxo-3,3-diphenylpropan-2-yl]carbamate (7, 305.4 mg, 0.382 mmol) was dissolved in a cold mixture of DCM (3 ml) and TFA (1 mL, 12.98 mmol) and the final solution stirred at 0° C. for 1.5 h, quenched at 0° C. by slow addition of saturated NaHCO3, then diluted with DCM, washed with saturated NaHCO3, dried over MgSO4, filtered and concentrated to afford 255 mg (95% yield) of the title compound as white foam submitted to the next step without further purification. MS: m/z=700.3 (MH+).

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