N-Cbz-d-alanine → [(R)-3-((R)-2-Amino-propionylamino)-2-hydroxy-propyl]-cyclohexylmethyl-phosphinic acid

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The title compound was prepared substantially following the procedures as set forth in Step 4, Example 1, Method B and employing ((R)-3-amino-2-hydroxy-propyl)-cyclohexylmethyl-phosphinic acid benzyl ester hydrochloride and N-Cbz-D-alanine as the starting materials. Subsequent hydrogenation of the resulting product in accordance with the procedures of Step 5, Example 1, Method B, and RP-HPLC purification yielded the title compound. 1H NMR (CD3OD, 300 MHz): δ 4.04 (m, 1H), 3.89 (q, J=6.9 Hz, 1H,), 3.39 (dd, J=5.7, 13.5, 1H), 3.23 (dd, J=5.4, 13.5 Hz, 1H,), 1.85 (m, 2H), 1.77-1.62 (m, 6H), 1.57-1.53 (m, 2H), 1.48 (d, J=6.9 Hz, 3H), 1.37-1.15 (m, 3H), 1.08-0.97 (m, 2H). 31P NMR (CD3OD, 300 MHz): δ 43.74. LCMS m/z: [M+H]+=307.2.

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