N-Carbobenzoxy-L-valine → ((R)-3-{(S)-2-[(S)-2-((S)-2-Benzyloxycarbonylamino-3-methyl-butyrylamino)-3-methyl-butyrylamino]-3-methyl-butyrylamino}-2-hydroxy-propyl)-cyclohexylmethyl-phosphinic acid benzyl ester

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The resulting product from Step 1 was deprotected in a similar manner as Example 1, step 3, and the compound was used immediately and coupled to N-Cbz-L-valine in accordance with the procedures set forth in Example 12, Method B. The crude product was purified by gradient flash chromatography (methanol/methylene chloride) on a RediSep disposable column. 1H NMR (CD3Cl, 300 MHz): δ 7.45-7.25 (m, 10H), 6.0-5.85 (m, 1H), 5.18-4.92 (m, 4H), 4.50-4.33 (m, 2H), 4.31-4.04 (m, 2H), 3.43-3.26 (m, 2H), 2.25-2.03 (m, 3H), 2.02-1.70 (m, 8H), 1.37-1.10 (m, 4H), 1.04-0.82 (m, 20H). LCMS m/z: [M+H]+=757.9.

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