[NH2:1][C:2]1[N:3]=[CH:4][C:5]([C:29]([O:31]CC)=[O:30])=[N:6][C:7]=1[C:8]1[CH:13]=[CH:12][C:11]([C:14](=[O:27])[NH:15][C@@H:16]([C:19]2[CH:24]=[C:23]([F:25])[CH:22]=[C:21]([Br:26])[CH:20]=2)[CH2:17][OH:18])=[C:10]([F:28])[CH:9]=1.O[Li].O>CO.C1COCC1.O>[NH2:1][C:2]1[N:3]=[CH:4][C:5]([C:29]([OH:31])=[O:30])=[N:6][C:7]=1[C:8]1[CH:13]=[CH:12][C:11]([C:14](=[O:27])[NH:15][C@@H:16]([C:19]2[CH:24]=[C:23]([F:25])[CH:22]=[C:21]([Br:26])[CH:20]=2)[CH2:17][OH:18])=[C:10]([F:28])[CH:9]=1A mixture of (S)-ethyl 5-amino-6-(4-((1-(3-bromo-5-fluorophenyl)-2-hydroxyethyl)carbamoyl)-3-fluorophenyl)pyrazine-2-carboxylate (220 mg, 0.422 mmol) and LiOH.H2O (142 mg, 3.38 mmol) in MeOH (2 ml), THF (2 mL) and Water (2 mL) was stirred for 3 hours at RT. The mixture was concentrated, to the residue was added 2 ml of water, 3N HCl was then added under stirring until the final pH was about 4. The resultant mixture was then concentrated and further dried to afford the crude product was a light yellow solid. (208 mg, 0.422 mmol, 100% yield). LC-MS (m/z): 494.9 (MH+), 0.653 min.
Wird geladen…