[CH2:1]([O:8][C:9]([N:11]([C@H:13]1[CH2:17][CH2:16][N:15](C(OC(C)(C)C)=O)[CH2:14]1)[CH3:12])=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1>FC(F)(F)C(O)=O.C(Cl)Cl>[CH3:12][N:11]([C@H:13]1[CH2:17][CH2:16][NH:15][CH2:14]1)[C:9](=[O:10])[O:8][CH2:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1A solution of tert-butyl (S)-3-(N-benzyloxycarbonyl-N-methylamino)pyrrolidine-1-carboxylate (Intermediate 130, 1.81 g) in trifluoroacetic acid (8 mL) and DCM (8 mL) was left to stand at room temperature for 30 minutes. The resultant mixture was concentrated in vacuo and the residue was dissolved in DCM and brine, basified with 2M sodium hydroxide and filtered through a phase separator. The filtrate was concentrated in vacuo to give benzyl N-methyl-(S)-pyrrolidin-3-ylcarbamate (1.46 g) as a light coloured oil.
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