C([O-])([O-])=O.[K+].[K+].[S:7]1[CH:11]=[CH:10][N:9]=[C:8]1[C:12]1[CH:17]=[CH:16][C:15]([CH2:18][N:19]([NH:38][C:39]([O:41][C:42]([CH3:45])([CH3:44])[CH3:43])=[O:40])[CH2:20][C@H:21]([OH:37])[C@@H:22]([NH:30]C(=O)C(F)(F)F)[CH2:23][C:24]2[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=2)=[CH:14][CH:13]=1>CO>[S:7]1[CH:11]=[CH:10][N:9]=[C:8]1[C:12]1[CH:17]=[CH:16][C:15]([CH2:18][N:19]([NH:38][C:39]([O:41][C:42]([CH3:45])([CH3:44])[CH3:43])=[O:40])[CH2:20][C@H:21]([OH:37])[C@@H:22]([NH2:30])[CH2:23][C:24]2[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=2)=[CH:14][CH:13]=155 ml of a 1N K2CO3 solution are added dropwise to 3.12 9 (5.5 mmol) of 1-[4-(thiazol-2-yl)-phenyl]-4(S)-hydroxy-2-(tert-butoxycarbonyl)amino-5(S) -(trifluoroacetyl)amino-6-phenyl-2-azahexane in 55 ml of methanol and the mixture is stirred at 70° C. for 9 hours. The mixture is cooled and ≈30 ml of methanol are evaporated off; methylene chloride and water are added and the aqueous phase is separated off and extracted with methylene chloride; the organic phases are washed with water, dried (Na2SO4) and concentrated by evaporation, yielding the title compound: HPLC20-100 : tRet =11.9; FAB MS (M+H)+ =469.
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