Trifluoroacetic acid → 4-[4-(2-(N-(2-fluorobenzyl)-N-methylamino)ethoxy)phenyl]-4-oxobutyric acid
Reaction equation
[F:1][C:2]1[CH:30]=[CH:29][CH:28]=[CH:27][C:3]=1[CH2:4][N:5]([CH2:7][CH2:8][O:9][C:10]1[CH:15]=[CH:14][C:13]([C:16](=[O:26])[CH2:17][CH2:18][C:19]([O:21]C(C)(C)C)=[O:20])=[CH:12][CH:11]=1)[CH3:6].FC(F)(F)C(O)=O>ClCCl>[F:1][C:2]1[CH:30]=[CH:29][CH:28]=[CH:27][C:3]=1[CH2:4][N:5]([CH2:7][CH2:8][O:9][C:10]1[CH:15]=[CH:14][C:13]([C:16](=[O:26])[CH2:17][CH2:18][C:19]([OH:21])=[O:20])=[CH:12][CH:11]=1)[CH3:6]Participants
4
Procedure
A solution of tert-Butyl 4-[4-(2-(N-(2-fluorobenzyl)-N-methylamine)ethoxy)phenyl]-4-oxobutyrate (Step E, 2.23 g, 5.3 mol) in dichloromethane (20 ml) was treated with trifluoroacetic acid (10 ml). The reaction mixture was stirred at ambient temperature for 2 hours, and concentrated in vacuo. The purification was done by flash chromatography on silica gel column (chloroform:methanol, 92.5:7.5-90:10 spiked with acetic acid) to provide the title compound.