C[O:2][C:3](=[O:38])[CH:4]([N:16]1[CH2:21][CH2:20][N:19]([C:22](=[O:33])[CH:23]([NH2:32])[CH2:24][C:25]2[CH:30]=[CH:29][C:28]([F:31])=[CH:27][CH:26]=2)[CH:18]([CH2:34][CH:35]=[CH2:36])[C:17]1=[O:37])[CH2:5][C:6]1[CH:15]=[CH:14][C:13]2[C:8](=[CH:9][CH:10]=[CH:11][CH:12]=2)[CH:7]=1.CO.[Li+].[OH-].Cl>C1COCC1.O>[CH2:34]([C@@H:18]1[N:19]([C:22](=[O:33])[C@H:23]([NH2:32])[CH2:24][C:25]2[CH:30]=[CH:29][C:28]([F:31])=[CH:27][CH:26]=2)[CH2:20][CH2:21][N:16]([C@@H:4]([CH2:5][C:6]2[CH:15]=[CH:14][C:13]3[C:8](=[CH:9][CH:10]=[CH:11][CH:12]=3)[CH:7]=2)[C:3]([OH:38])=[O:2])[C:17]1=[O:37])[CH:35]=[CH2:36]To a solution of 2-{3-allyl-4-[2-amino-3-(4-fluorophenyl)propionyl]-2-oxo-piperazin-1-yl}-3-naphthalen-2-yl-propionic acid methyl ester, 10, (168 mg, 0.324 mmol) in a mixture of THF (1 mL)/CH3OH (0.5 mL)/H2O (0.5 mL) is added LiOH (43 mg, 1.78 mmol). The reaction mixture is stirred for 3 hours, acidified with 1N HCl to pH 3 and extracted with EtOAc. The extract is dried over Na2SO4, filtered, concentrated and dried under high vacuum to afford the desired product in quantitative yield.
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