Trifluoroacetic acid → (2S)-2-{[(Z)-1-methyl-3-(4-methylphenyl)-3-oxo-1-propenyl]amino}-3-{4-[2-(5-methyl-2-phenyl-1,3-oxazol-4-yl)ethoxy]phenyl}propanoic acid

Reaction equation

[NH2:1][C@@H:2]([CH2:6][C:7]1[CH:12]=[CH:11][C:10]([O:13][CH2:14][CH2:15][C:16]2[N:17]=[C:18]([C:22]3[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=3)[O:19][C:20]=2[CH3:21])=[CH:9][CH:8]=1)[C:3]([OH:5])=[O:4].C(O)(C(F)(F)F)=O.[CH3:35][C:36]1[CH:41]=[CH:40][C:39]([C:42](=[O:47])[CH2:43][C:44](=O)[CH3:45])=[CH:38][CH:37]=1>>[CH3:45]/[C:44](/[NH:1][C@@H:2]([CH2:6][C:7]1[CH:12]=[CH:11][C:10]([O:13][CH2:14][CH2:15][C:16]2[N:17]=[C:18]([C:22]3[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=3)[O:19][C:20]=2[CH3:21])=[CH:9][CH:8]=1)[C:3]([OH:5])=[O:4])=[CH:43]/[C:42]([C:39]1[CH:38]=[CH:37][C:36]([CH3:35])=[CH:41][CH:40]=1)=[O:47]

Participants

Reactant 3

HCID 6422Trifluoroacetic acid

HCID 4326511-(4-Methylphenyl)butane-1,3-dione

HCID 18343040(2S)-2-amino-3-{4-[2-(5-methyl-2-phenyl-1,3oxazol-4-yl)ethoxy]phenyl}propanoic acid

Product 1

HCID 9828201(2S)-2-{[(Z)-1-methyl-3-(4-methylphenyl)-3-oxo-1-propenyl]amino}-3-{4-[2-(5-methyl-2-phenyl-1,3-oxazol-4-yl)ethoxy]phenyl}propanoic acid

Procedure

The title compound was prepared (as described above for the preparation of Example 2) from 790 mg (1.64 mmol) of Intermediate 45 (as the TFA salt) and 0.29 g (1.64 mmol) of Intermediate 27 (with 660 μL of DCA replacing Et3N) to yield crude product contaminated with DCA). A second silica gel chromatography column eluting with 8:1 DCM:MeOH gave 70 mg of Example 19 as a beige-colored solid: TLC (DCM/MeOH (4:1): Rf=0.58; 1H NMR (DMSO-d6, 400 MHz) δ11.43 (d, 1H, J=9.0), 7.96 (m, 2H), 7.74 (d, 2H, J=8.1), 7.54 (m, 3H), 7.24 (d, 2H, J=8.1), 7.18 (d, 2H, J=8.4), 6.87 (d, 2H, J=8.4), 5.57 (s, 1H), 4.21 (t, 2H, J=6.6), 4.08 (m, 1H), 3.23 (m, 2H), 2.95 (t, 2H, J=6.6), 2.80(dd, 1H, J=13.8, 9.0), 2.39 (s, 3H), 2.37 (s, 3H), 1.71 (s, 3H); low resolution MS (ES+)m/e 525.2 (MH+).