(2R, 3S)-N-[(tert-Butyloxy)carbonyl]-3-amino-4-phenyl-2-(triisopropylsilyloxy) butan-1-ol → (2R 3S)-N-[(tert-butyloxy)carbonyl]-3-amino-2-(triisopropylsilyloxy)-4-cyclohexyl-1-butanol

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The monosilylated diol of Step 2 was hydrogenated with 5% Rh-C at 60 psi and 60° C. in MeOH (135 mL). The mixture was filtered and the filtrate evaporated. The residue was purified by chromatography, eluting with (15% EtOAc in hexane) to give the title alcohol (8.70 g, 67% yield, mp 61°-63° C.). The 1H, 13C, and APT NMR spectral data were consistent with the proposed product.

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