C(OC(=O)[NH:7][C@H:8]([CH2:27][C:28]1[CH:33]=[CH:32][C:31]([O:34][CH3:35])=[CH:30][CH:29]=1)[C:9](=[O:26])[N:10]1[CH2:13][C:12]([CH2:21][CH2:22][CH2:23][CH2:24][CH3:25])([C:14]2[CH:19]=[CH:18][C:17]([F:20])=[CH:16][CH:15]=2)[CH2:11]1)(C)(C)C.FC(F)(F)C(O)=O>ClCCl>[NH2:7][C@H:8]([CH2:27][C:28]1[CH:29]=[CH:30][C:31]([O:34][CH3:35])=[CH:32][CH:33]=1)[C:9]([N:10]1[CH2:11][C:12]([CH2:21][CH2:22][CH2:23][CH2:24][CH3:25])([C:14]2[CH:19]=[CH:18][C:17]([F:20])=[CH:16][CH:15]=2)[CH2:13]1)=[O:26]780 mg (1.56 mmol) of tert-butyl[(R)-1-(4-methoxybenzyl)-2-oxo-2-(3-pentyl-3-(4-fluoro-phenyl)azetidin-1-yl)ethyl]carbamate are solubilized in 10 ml of dichloromethane. 4 ml of trifluoroacetic acid are introduced. The reaction medium is stirred for 1 hour and then concentrated to dryness. The residue is taken up in a 1N aqueous solution of sodium hydroxide and extracted with dichloromethane and then the resulting product is dried over magnesium sulphate, filtered and evaporated.
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