Cl.[CH3:2][O:3][C:4](=[O:11])[C@H:5]([CH2:7][CH:8]([CH3:10])[CH3:9])[NH2:6].CN1CCOCC1.C1C=CC2N(O)N=NC=2C=1.CCN=C=NCCCN(C)C.[CH3:40][CH:41]([CH2:43][C@H:44]([OH:48])[C:45](O)=[O:46])[CH3:42]>C(Cl)Cl>[OH:48][C@@H:44]([CH2:43][CH:41]([CH3:42])[CH3:40])[C:45]([NH:6][C@H:5]([C:4]([O:3][CH3:2])=[O:11])[CH2:7][CH:8]([CH3:10])[CH3:9])=[O:46]To a solution of L-leucine methyl ester hydrochloride (1.97 g) dissolved in DCM (32 mL) was added NMM (1.9 mL) and the mixture was stirred for 5 minutes before being cooled to 0° C. HOBt (4.0 g), EDAC (3.8 g) and L-α-hydroxyisocaproic acid (1.35 g) were then added sequentially to the reaction mixture. After 30 minutes at 0° C., the reaction was allowed to warm to room temperature and continued stirring overnight. The reaction mixture was concentrated and the resulting crude product was dissolved in EtOAc and washed 2×1.2N HCl, 2× saturated NaHCO3, brine, dried (MgSO4) and concentrated to yield the desired product (2.32 g, 82%). 1H NMR (300 MHz, CDCl3) δ 0.93-0.96 (m, 12H), 1.50-1.67 (m, 5H), 1.82-1.93 (m, 1H), 3.73 (s, 3H), 3.83 (bs, 1H), 4.11-4.18 (m, 1H), 4.57-4.64 (m, 1H), 7.07 (d, 1H).
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