C(OC([N:8]1[CH2:11][CH:10]([CH2:12][C:13]2[CH:18]=[CH:17][C:16]([Cl:19])=[CH:15][CH:14]=2)[CH2:9]1)=O)(C)(C)C.[F:20][C:21]([F:26])([F:25])[C:22]([OH:24])=[O:23]>ClCCl>[F:20][C:21]([F:26])([F:25])[C:22]([O-:24])=[O:23].[Cl:19][C:16]1[CH:15]=[CH:14][C:13]([CH2:12][CH:10]2[CH2:9][NH2+:8][CH2:11]2)=[CH:18][CH:17]=1A solution of 3-(4-Chloro-benzyl)-azetidine-1-carboxylic acid tert-butyl ester (1.61 g, 5.71 mmol) in dichloromethane (20 ml) is treated with trifluoroacetic acid (20 ml) and stirred at ambient temperature for 1 hour. The reaction mixture is evaporated and then re-suspended in toluene and evaporated to dryness to afford 3-(4-Chloro-benzyl)-azetidinium trifluoroacetate salt. [MH]+ of free base 182.12.
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