反应详情

(R/S)-2-Hydroxy-2-(4-(5-(3-phenyl-4-(trifluoromethyl)isoxazol-5-yl)-1,2,4-oxadiazol-3-yl)phenyl)acetic acid (Int-V, 20 mg, 0.046 mmol) was dissolved in DMF (1 mL) prior to the addition of 4-methylmorpholine (0.031 mL, 0.278 mmol), (S)-2-amino-N-methylpropanamide-HCl (6.43 mg, 0.046 mmol), and HATU (31.7 mg, 0.083 mmol). The reaction mixture was stirred overnight and was then purified via preparative LCMS with the following conditions: Column: Waters XBridge C18, 19×250 mm, 5-μm particles; Guard Column: Waters XBridge C18, 19×10 mm, 5-μm particles; Mobile Phase A: 5:95 methanol:water with 10-mM ammonium acetate; Mobile Phase B: 95:5 methanol:water with 10-mM ammonium acetate; Gradient: 50-100% B over 25 minutes, then a 5-minute hold at 100% B; Flow rate=20 mL/min. Fractions containing the desired product were combined and dried via centrifugal evaporation to give (R/S)-2-(2-hydroxy-2-(4-(5-(3-phenyl-4-(trifluoromethyl)isoxazol-5-yl)-1,2,4-oxadiazol-3-yl)phenyl)acetamido)-N-methyl(S)propanamide (9.6 mg, 0.019 mmol, 40.2% yield): LCMS=516.1 [M+H]+; 1H NMR (Mixture of Diastereomers, 400 MHz, methanol-d4) δ ppm 8.11-8.25 (4 H, m), 7.50-7.78 (14 H, m), 5.16 (2 H, d, J=3.08 Hz), 4.37 (2 H, qd, J=7.08, 1.43 Hz), 2.75 (3 H, s), 2.72 (3 H, s), 1.39 (3 H, d, J=7.26 Hz), 1.35 (3 H, d, J=7.04 Hz); Analytical LCMS: column: Mac-mod Halo C18, 4.6×50 mm, 2.7-μm particles; Mobile Phase A: 5:95 acetonitrile:water with 10 mM ammonium acetate; Mobile Phase B: 90:10 acetonitrile:water with 10 mM ammonium acetate; Temperature: 45° C.; Gradient: 0-100% B over 4 minutes, flow rate=4 mL/min, product retention=2.3 min+2.4 min (mixture of diastereomers).

1. customwas then purified via preparative LCMS with the following conditions
2. waitGradient: 50-100% B over 25 minutes
3. customa 5-minute hold
4. additionFractions containing the desired product
5. customdried via centrifugal evaporation